Hyoscyamus niger
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'''Black henbane''' (''Hyoscyamus niger'' L., Solanaceae) is a toxic herbaceous plant whose preparations act as anticholinergic [[substance_class:psychoactive/deliriant|deliriants]]. Its dominant psychoactive alkaloids are [[substance:scopolamine]] (hyoscine) and hyoscyamine, both of which block [[glossary:muscarinic-acetylcholine-receptor|muscarinic acetylcholine receptors]] throughout the nervous system{{cite|doi=10.1007/s13659-022-00357-w|anchor=14ff26c6}}. Scopolamine drives the central effects — [[effect:sedation]], [[effect:amnesia]], and [[effect:delirium]] — by suppressing [[substance_class:chemical/cholinergic]] signaling across the brain{{cite|pubmed=16175141|anchor=d10ab789}}.
Archaeological evidence places deliberate human use of ''H. niger'' at least as far back as 4,000 BC{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=2ae4372c}}. Greek priests used it at oracular sites, medieval Europeans added it to beer and flying ointments, and its alkaloids were eventually isolated and developed into modern pharmaceuticals. The plant remains [[glossary:unscheduled]] under international drug treaties, though some jurisdictions impose restrictions{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=29da7504}}.
[[index:effects|Subjective effects]] include delirium, visual and [[effect:auditory-hallucinations]], amnesia, and severe cognitive [[glossary:disorientation]]. The defining quality is anticholinergic delirium — a non-lucid, agitated state in which the person cannot distinguish [[glossary:hallucination]] from reality and has no [[glossary:awareness]] of being intoxicated{{cite|pubmed=25386392|anchor=22b1de68}}. Peripheral effects — dilated pupils, [[glossary:tachycardia|rapid heart rate]], [[effect:dry-mouth]], and urinary retention — accompany every psychoactive dose.
No [[glossary:dependence]] or [[glossary:withdrawal]] has been documented; the aversive nature of anticholinergic delirium strongly limits voluntary repeat use{{cite|doi=10.1371/journal.pone.0247688|anchor=d62af336}}. The margin between a psychoactive dose and a dangerous one is narrow and unpredictable — alkaloid content varies enormously across strains, plant parts, and growing conditions{{cite|pubmed=25386392|anchor=4ffcade5}}. No clinical trials have tested crude preparations, and how the alkaloids behave in the body after plant [[glossary:ingestion]] remains uncharacterized{{cite|pubmed=2762223|anchor=78cf580e}}.
'''Black henbane''' (''Hyoscyamus niger'' L., Solanaceae) is a toxic herbaceous plant whose crude preparations function as anticholinergic [[substance_class:psychoactive/deliriant|deliriants]]. Its principal psychoactive alkaloids, [[substance:scopolamine]] and hyoscyamine, are competitive [[substance_class:pharmacological/muscarinic-acetylcholine-receptor-antagonist|muscarinic acetylcholine receptor antagonists]]{{cite|doi=10.1007/s13659-022-00357-w|anchor=5fa10c8a}}. Scopolamine drives the [[glossary:central-nervous-system]] effects — [[effect:sedation]], [[effect:amnesia]], and [[effect:delirium]] — by blocking muscarinic signaling across cortical and subcortical brain regions{{cite|pubmed=16175141|anchor=b8a990b1}}.
Archaeological evidence places deliberate human use of ''H. niger'' at least as far back as 4,000 BC in southern and central Europe{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=9b6b4a4a}}. The plant served as a sedative, ritual intoxicant, and brewing additive through the classical and medieval periods before its alkaloids were isolated and developed into modern pharmaceuticals. It remains [[glossary:unscheduled]] under international drug treaties, though individual jurisdictions impose restrictions{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=40eac37a}}.
[[index:effects|Subjective effects]] include delirium, visual and [[effect:auditory-hallucinations]], amnesia, sedation, and severe cognitive [[glossary:disorientation]]. The defining quality is anticholinergic delirium — a non-lucid, agitated state in which the user cannot distinguish [[glossary:hallucination]] from reality and has no [[glossary:awareness]] of [[glossary:intoxication]]{{cite|pubmed=25386392|anchor=ca2b223b}}. Peripheral effects — [[effect:pupil-dilation]], [[glossary:tachycardia]], [[effect:dry-mouth]], and urinary retention — accompany all psychoactive doses.
No [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] data exist for ''H. niger''; the aversive nature of anticholinergic delirium strongly limits voluntary repeat use{{cite|doi=10.1371/journal.pone.0247688|anchor=34fef89c}}. The margin between psychoactive and life-threatening doses is narrow and clinically unreliable, driven by extreme alkaloid variability across strains, plant parts, and growing conditions{{cite|pubmed=25386392|anchor=00b028cf}}. No clinical trials have been conducted using crude ''H. niger'' preparations, and [[glossary:pharmacokinetics]] of plant-derived alkaloid [[glossary:ingestion]] remain uncharacterized{{cite|pubmed=2762223|anchor=8ca2904e}}.
'''Hyoscyamus niger''' ('''black henbane''', '''stinking nightshade''') is an annual or biennial herbaceous plant of the family Solanaceae, native to the Mediterranean basin and western Asia. It is classified as a [[substance_class:psychoactive/deliriant]] — its pharmacology is driven by the [[substance_class:chemical/tropane]] alkaloids [[substance:scopolamine]] and hyoscyamine, which produce anticholinergic [[glossary:toxidrome]] at doses readily achievable from crude [[glossary:plant-material]]{{cite|doi=10.1007/s13659-022-00357-w|anchor=9a1a9a50}}. Historical preparations include [[glossary:ingestion|oral ingestion]] of seeds, leaves, or flowers, transdermal application in ointments, and smoking; acute effects typically resolve within 24 hours{{cite|pubmed=25386392|anchor=496b0403}}.
''H. niger'' was formally described by Carl Linnaeus in ''Species Plantarum'' (1753) and has one of the longest documented histories of human use among psychoactive plants, with archaeological evidence of deliberate storage and consumption dating to at least 4,000 BC in southern and central Europe{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=74bbf06d}}. Its primary alkaloids became foundational pharmaceutical agents — both scopolamine and hyoscyamine appear on the WHO List of Essential Medicines. No clinical trials have been conducted using ''H. niger'' plant preparations. The plant remains [[glossary:unscheduled]] under [[glossary:drug-control|international drug control]] treaties, though individual jurisdictions impose restrictions{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=ebbe349d}}.
Scopolamine and hyoscyamine are competitive, non-selective [[glossary:muscarinic-acetylcholine-receptor]] (mAChR) [[glossary:antagonist|antagonists]] that block [[glossary:acetylcholine]] at M1, M2, and M3 [[glossary:receptor-subtypes]]. Scopolamine has superior [[glossary:blood-brain-barrier]] penetration, producing the [[glossary:central-nervous-system]] effects — [[effect:sedation]], [[effect:amnesia]], and at toxic doses, [[effect:delirium]] with [[glossary:hallucination|hallucinations]]{{cite|pubmed=16175141|anchor=6b854129}}. Oral [[glossary:bioavailability]] of purified scopolamine ranges from 3–27% with a [[glossary:plasma]] [[glossary:half-life]] of approximately 4.5 hours; no pharmacokinetic data exist for crude plant preparations{{cite|pubmed=2762223|anchor=380bbaee}}.
The dominant experiential domain is anticholinergic delirium — an agitated, non-lucid state with visual, auditory, and [[effect:tactile-hallucination|tactile hallucinations]] and severely impaired reality testing. Peripheral effects include [[effect:pupil-dilation]], [[glossary:tachycardia]], anhidrosis, and urinary retention. Effects vary substantially by plant part, geographic strain — alkaloid content differs more than 10-fold between European and Egyptian populations — and individual anticholinergic [[glossary:sensitivity]]{{cite|pubmed=25386392|anchor=b5fa3e39}}.
''H. niger'' is a highly toxic plant with no established safe dose for any preparation. The margin between psychoactive and life-threatening effects is narrow and clinically unreliable due to extreme alkaloid variability across strains, plant parts, and growing conditions. No [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] data exist for ''H. niger'' or its alkaloids in non-pharmaceutical contexts; the aversive nature of anticholinergic delirium strongly limits voluntary repeat use{{cite|doi=10.1371/journal.pone.0247688|anchor=a9a9f967}}. Physostigmine, a cholinesterase [[glossary:inhibitor]], is the specific antidote for severe anticholinergic toxidrome{{cite|doi=10.1080/15563650.2020.1854281|anchor=cd953ff8}}. Children, elderly individuals, and persons taking anticholinergic [[glossary:medication|medications]] face substantially elevated risk. The [[glossary:pharmacokinetics]] of alkaloids consumed via crude plant material remain uncharacterized.
===Traditional and historical use===
''Hyoscyamus niger'' was formally described by Carl Linnaeus in ''Species Plantarum'' (1753){{cite|name=powo-hyoscyamus|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Hyoscyamus niger L. - Plants of the World Online|anchor=62044864}}, though archaeological evidence documents deliberate human use dating to at least 4,000 BC{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=30484a02}}. Seeds have been recovered from 65 of 83 Roman-period archaeological sites in the Netherlands, and a hollowed bone containing over 1,000 seeds — dated to approximately AD 70–100 — suggests deliberate medicinal or ritual storage{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=25d43ac3}}.
In Greek antiquity the plant was known as ''Herba Apollinaris'' and used by oracular priests and priestesses — including at Delphi — to induce trance states{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=3619bfeb}}. Dioscorides documented it as a sedative and analgesic in ''De Materia Medica'', while Pliny the Elder described it as "of the nature of wine and therefore offensive to the understanding"{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=705ba7d6}}. Seeds recovered from a Viking grave at Fyrkat, Denmark have prompted speculation that anticholinergic [[glossary:intoxication]] may have contributed to the berserker states described in Norse sagas, though this remains unconfirmed{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=9c7fb336}}.
===Medieval and early modern use===
In medieval Europe, ''H. niger'' became a documented ingredient in transdermal "flying ointments" associated with witchcraft — the anticholinergic [[effect:delirium]] they produced, including sensations of flight, likely gave rise to broomstick-riding folklore{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=b1cc9144}}. The plant also served as a beer additive in the herbal mixture called ''gruit'' before hops became standard; the Bavarian Purity Law of 1516 (''Reinheitsgebot'') effectively ended its use in brewing{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=12c177e0}}.
Teodorico Borgognoni (1205–1296) included narcotic plants — likely including henbane — in his surgical anesthetic preparations{{cite|doi=10.3390/life13091913|anchor=d1badfee}}. Shakespeare referenced henbane in ''Hamlet'' as the poison used to murder Hamlet's father, reflecting its established reputation in Elizabethan England. Ibn Sina (Avicenna, 980–1037 AD) described ''H. niger'' in the ''Canon of Medicine'' for [[effect:pain-suppression]], including toothache and joint pain{{flag|citation-needed}}, and contemporary ethnobotanical surveys document its continued traditional medicinal use among High Atlas Tashelhit-speaking communities in Morocco{{cite|doi=10.1016/j.jep.2016.05.009|anchor=fa435002}}.
===Pharmaceutical development===
The isolation of hyoscyamine and [[substance:scopolamine]] in the 19th and 20th centuries transformed ''H. niger'' from a folk remedy into a source of clinical-grade pharmaceutical agents. Scopolamine became one of the first drugs delivered via a transdermal patch system for motion sickness prevention{{cite|pubmed=16175141|anchor=e456305b}}. Both alkaloids now appear on the WHO List of Essential Medicines, though commercial-scale production has shifted from ''H. niger'' to hybrid ''Duboisia myoporoides'' × ''D. leichhardtii'' crops cultivated in Australia{{cite|doi=10.1093/pcp/pcx165|anchor=ba896acb}}.
{{DiscoverMore|Culture and lore}}
Henbane's long entanglement with European folk culture is preserved in its common names: "stinking nightshade" references its foetid smell; "henbane" derives from the Anglo-Saxon ''hennebana'' ("hen-killer"), reflecting its known [[glossary:toxicity]] to poultry. The plant's association with witchcraft, poison, and oracular prophecy recurs across classical, medieval, and early modern literature — from Dioscorides to Shakespeare — making it one of the most culturally embedded toxic plants in Western history. Plants containing [[substance_class:chemical/cholinergic]] [[glossary:antagonist|antagonists]], including henbane, were recorded historically for [[effect:amnesia]]-inducing properties long before the cholinergic [[glossary:hypothesis]] of Alzheimer's disease was established{{cite|doi=10.1211/0022357991772808|anchor=aa575b26}}.
{{/DiscoverMore}}
===Traditional and historical use===
Formally described by Carl Linnaeus in 1753{{cite|name=powo-hyoscyamus|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Hyoscyamus niger L. - Plants of the World Online|anchor=e9c7beb7}}, ''H. niger'' has documented human use stretching back at least 4,000 years{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=c1dc51c7}}. In Greek antiquity it was known as ''Herba Apollinaris'' and used by oracular priests at Delphi to induce trance states; Dioscorides documented it as a sedative and analgesic{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=5ffeded2}}. Seeds recovered from a Viking grave at Fyrkat, Denmark have prompted speculation about its role in the berserker states described in Norse sagas — though this remains unconfirmed{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=8bfffd65}}.
===Medieval and early modern use===
In medieval Europe, henbane was added to beer before hops became standard; the Bavarian Purity Law of 1516 effectively ended the practice{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=1508ead4}}. It also appeared in transdermal "flying ointments" associated with witchcraft — the anticholinergic [[effect:delirium]] those preparations produced, including vivid sensations of flight, likely gave rise to broomstick-riding folklore{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=d0765203}}. Teodorico Borgognoni incorporated narcotic plants including henbane in medieval surgical anesthetics{{cite|doi=10.3390/life13091913|anchor=499e0272}}, and contemporary ethnobotanical surveys document continued traditional medicinal use among Tashelhit-speaking communities in Morocco{{cite|doi=10.1016/j.jep.2016.05.009|anchor=bafb03bf}}.
===Pharmaceutical development===
The isolation of hyoscyamine and [[substance:scopolamine]] in the 19th and 20th centuries transformed henbane from a folk remedy into a pharmaceutical source. Scopolamine became one of the first [[glossary:medication|medications]] delivered via a transdermal patch — for motion sickness prevention{{cite|pubmed=16175141|anchor=2c9e8472}}. Both alkaloids now appear on the WHO List of Essential Medicines, though commercial production has shifted to hybrid ''Duboisia'' crops cultivated in Australia{{cite|doi=10.1093/pcp/pcx165|anchor=d4f9aff8}}.
{{DiscoverMore|Culture and lore}}
Henbane's common names reflect its history: "stinking nightshade" references its foetid smell; "henbane" derives from the Anglo-Saxon ''hennebana'' ("hen-killer"), reflecting its known [[glossary:toxicity]] to poultry. Its association with witchcraft, poison, and oracular prophecy recurs across classical, medieval, and early modern literature — from Dioscorides to Shakespeare. Plants with [[substance_class:chemical/cholinergic]] [[glossary:antagonist]] properties — including henbane — were recorded for [[effect:amnesia]]-inducing effects long before the cholinergic [[glossary:hypothesis]] of Alzheimer's disease was established{{cite|doi=10.1211/0022357991772808|anchor=a696ba54}}.
{{/DiscoverMore}}
===Discovery and early record===
''Hyoscyamus niger'' was formally described by Carl Linnaeus in ''Species Plantarum'': 179 (1753), the founding work of modern botanical [[glossary:chemical-nomenclature|nomenclature]]{{cite|name=powo-hyoscyamus|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Hyoscyamus niger L. - Plants of the World Online|anchor=993bebf3}}. The plant was known to European and Near Eastern physicians for millennia before its formal taxonomic placement.
Archaeological evidence documents deliberate human use dating to at least 4,000 BC across southern and central Europe and Eurasia{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=a52cbc18}}. Seeds of ''H. niger'' have been recovered from 65 of 83 Roman-period archaeological sites in the Netherlands. A hollowed sheep or goat bone plugged with birch-bark tar and containing over 1,000 ''H. niger'' seeds, recovered from a Roman site dated to approximately AD 70–100, suggests deliberate medicinal or ritual storage{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=8ca24670}}.
===Classical and medieval use===
In ancient Greek medicine, ''H. niger'' was recorded as ''Herba Apollinaris'' — the plant of Apollo — and was used by priests and priestesses at oracular sites including Delphi to induce trance states facilitating communication with divine realms{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=f610d97e}}. Pedanius Dioscorides (1st century AD) documented ''H. niger'' as a sedative and analgesic in ''De Materia Medica'', recommending it for [[effect:pain-suppression]] and sleep induction. Pliny the Elder described it as "of the nature of wine and therefore offensive to the understanding" — an early acknowledgment of its intoxicating and cognitively disruptive properties{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=35365f7f}}.
Henbane seeds have been recovered from a Viking grave at Fyrkat, Denmark (first described 1977). The anticholinergic symptoms induced by ''H. niger'' — [[glossary:agitation]], [[glossary:aggression]], [[effect:confusion]], and apparent physical endurance — have been proposed as potentially consistent with the berserker rage state described in Norse sagas, though this association remains speculative and clinically unconfirmed{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=0e70a625}}.
In medieval Europe, ''H. niger'' became associated with witchcraft as a documented ingredient in "flying ointments" applied transdermally. The anticholinergic [[effect:delirium]] these ointments produced — including sensations of flight — accounts for the folkloric association between witches and broomsticks{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=4c37cbd0}}. ''H. niger'' was also a beer additive in northern European brewing as part of the herbal mixture called ''gruit'' before hops became standard; the Bavarian Purity Law of 1516 (''Reinheitsgebot'') effectively banned its use in brewing{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=487658ac}}. Teodorico Borgognoni (1205–1296) included narcotic plants — likely including henbane — in his anesthetic preparations documented in ''Cyrurgia seu filia principis''{{cite|doi=10.3390/life13091913|anchor=99ddfbe8}}. Shakespeare referenced henbane in ''Hamlet'' (Act 1, Scene 5) as the murder weapon used against Hamlet's father, reflecting its established reputation as a potent poison in Elizabethan England.
===Islamic medicine and continued traditional use===
Ibn Sina (Avicenna, 980–1037 AD) is widely credited with describing ''H. niger'' in the ''Canon of Medicine'' for pain relief, including toothache and joint pain{{flag|citation-needed}}. Contemporary ethnobotanical surveys document continued traditional medicinal use of ''H. niger'' in Morocco among High Atlas Tashelhit-speaking communities{{cite|doi=10.1016/j.jep.2016.05.009|anchor=b12272a2}}. Plants containing [[substance_class:chemical/cholinergic]] [[glossary:antagonist|antagonists]], including henbane, were recorded historically for [[effect:amnesia]]-inducing properties long before the cholinergic [[glossary:hypothesis]] of Alzheimer's disease was established{{cite|doi=10.1211/0022357991772808|anchor=84bcf8ee}}.
===Pharmaceutical development===
The isolation and pharmaceutical development of hyoscyamine and [[substance:scopolamine]] in the 19th and 20th centuries transformed ''H. niger''s alkaloids into clinical agents. Scopolamine was among the first drugs made commercially available in a transdermal delivery system (TTS-patch) for motion sickness prevention{{cite|pubmed=16175141|anchor=52c8a5a8}}. Both alkaloids are listed on the WHO List of Essential Medicines and have [[glossary:fda]]-approved formulations. Commercial-scale alkaloid production now primarily uses hybrid ''Duboisia myoporoides'' x ''D. leichhardtii'' crops in Australia rather than ''H. niger''{{cite|doi=10.1093/pcp/pcx165|anchor=fb71c364}}.
''Hyoscyamus niger'' L. belongs to the family Solanaceae (nightshades), sharing its family with ''Atropa belladonna'', ''Datura stramonium'', tobacco, and tomato. The genus ''Hyoscyamus'' contains approximately 20 species distributed across the Mediterranean, Middle East, and central Asia; ''H. niger'' is the most widely documented species for both medicinal and psychoactive use.
The plant is native to the Mediterranean basin and western Asia but has naturalized across much of Europe, northern Africa, and temperate North America, where several US states and Canadian provinces classify it as a noxious weed{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=e6b92f91}}. It favours disturbed ground, roadsides, field margins, and waste areas with well-drained, nitrogen-rich soil.
''H. niger'' grows as an annual or biennial herb, reaching 30–100 cm in height. Its leaves are large, ovate, and coarsely toothed with a sticky, glandular-hairy surface that produces a distinctive unpleasant odour — hence the common name "stinking nightshade." Flowers are funnel-shaped, pale yellow with prominent dark purple veining, and arranged in one-sided terminal clusters. The fruit is a capsule (pyxis) enclosed in the persistent calyx, containing numerous small, kidney-shaped seeds — the plant part most frequently implicated in accidental poisonings due to their resemblance to poppy or mustard seeds{{flag|citation-needed}}.
All parts of the plant contain [[substance_class:chemical/tropane]] alkaloids, but concentration varies significantly by tissue: seeds and roots typically carry the highest alkaloid loads, while leaves and flowers contain lower but still pharmacologically active quantities{{cite|pubmed=25386392|anchor=7bfc1be9}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=fbb3c7fc}}. [[glossary:potency]] also varies substantially across geographic populations — alkaloid content can differ more than 10-fold between European and Egyptian strains{{cite|pubmed=25386392|anchor=cc72925f}}.
| Family | Solanaceae |
| Tribe | Hyoscyameae |
| Genus | ''Hyoscyamus'' |
| Species | ''Hyoscyamus niger'' L. |
| Native range | Mediterranean to Iran |
| Growth habit | Annual or biennial herb (temperate biome) |
| POWO accepted name | ''Hyoscyamus niger'' L.{{cite|name=powo-hyoscyamus|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Hyoscyamus niger L. - Plants of the World Online|anchor=999a8f25}} |
''Hyoscyamus niger'' L. belongs to the family Solanaceae — the nightshades — sharing this family with ''Atropa belladonna'', ''Datura stramonium'', tobacco, and tomato. The genus ''Hyoscyamus'' contains approximately 20 species distributed across the Mediterranean, Middle East, and central Asia. ''H. niger'' is the species most widely documented for both medicinal and psychoactive use.
The plant is native to the Mediterranean basin and western Asia but has naturalized across much of Europe, northern Africa, and temperate North America. Several US states and Canadian provinces classify it as a noxious weed{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=c185ecd7}}. It favours disturbed ground, roadsides, and waste areas with well-drained, nitrogen-rich soil.
''H. niger'' grows as an annual or biennial herb, reaching 30–100 cm tall. Its leaves are large, coarsely toothed, and covered in sticky glandular hairs that produce a strong unpleasant odour — hence "stinking nightshade." Flowers are funnel-shaped and pale yellow with dark purple veining. The seeds are small and kidney-shaped, easily mistaken for poppy or mustard seeds{{flag|citation-needed}} — the plant part most often involved in accidental poisonings. All parts contain [[substance_class:chemical/tropane]] alkaloids, with seeds and roots carrying the highest concentrations{{cite|pubmed=25386392|anchor=71fb0690}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=ea399464}}.
The psychoactive and toxic properties of ''H. niger'' are driven by two [[substance_class:chemical/tropane]] alkaloids: [[substance:scopolamine]] (hyoscine) and hyoscyamine. Both block [[glossary:muscarinic-acetylcholine-receptor|muscarinic acetylcholine receptors]] throughout the nervous system{{cite|doi=10.1007/s13659-022-00357-w|anchor=08390d2f}}. Scopolamine crosses the [[glossary:blood-brain-barrier]] more readily and is responsible for the [[effect:sedation]], [[effect:amnesia]], and [[effect:delirium]] that characterize henbane [[glossary:intoxication]].
Hyoscyamine — whose [[glossary:racemic-mixture]] form is the pharmaceutical atropine — exerts predominantly peripheral effects at lower doses, with central effects appearing only at higher concentrations{{cite|doi=10.1007/s13659-022-00357-w|anchor=5701b679}}{{cite|pubmed=25386392|anchor=0dbe5158}}. Minor alkaloids including atroscine and cuscohygrine are present but contribute minimally to the overall pharmacological profile{{flag|citation-needed}}.
Alkaloid content varies dramatically across plant parts, geographic strains, and growing conditions — more than 10-fold between European and Egyptian populations{{cite|pubmed=25386392|anchor=a6a35f13}}. This variability is the main reason dose prediction from crude [[glossary:plant-material]] is clinically unreliable. The European Food Safety Authority set a group Acute Reference Dose of '''0.016 µg/kg body weight''' for the combined alkaloids{{cite|doi=10.2903/j.efsa.2013.3386|anchor=ecf55b7e}} — a threshold so low that trace food [[glossary:contamination]] can exceed it, particularly for young children{{cite|doi=10.2903/j.efsa.2013.3386|anchor=7c3c7a30}}.
===Primary alkaloids===
The pharmacological activity of ''H. niger'' is driven by two [[substance_class:chemical/tropane]] alkaloids: '''hyoscyamine''' (L-hyoscyamine; C₁₇H₂₃NO₃, MW 289.4 g/mol) and '''scopolamine''' (L-hyoscine; C₁₇H₂₁NO₄, MW 303.35 g/mol). [[substance:scopolamine]] is the 6,7-epoxide [[glossary:derivative]] of hyoscyamine and has superior [[glossary:central-nervous-system]] penetration{{cite|doi=10.1007/s13659-022-00357-w|anchor=738e9622}}. A defining characteristic of ''H. niger'' relative to other ''Hyoscyamus'' species is its relatively high scopolamine-to-hyoscyamine ratio{{cite|doi=10.1007/s13659-022-00357-w|anchor=5f181c30}}.
===Quantified concentrations===
HPLC-DAD analysis of ''H. niger'' roots under optimized ultrasound-assisted extraction yielded hyoscyamine at 164.72 µg/g dry weight and scopolamine at 209.23 µg/g dry weight, confirming that scopolamine exceeds hyoscyamine in root tissue{{cite|doi=10.1016/j.heliyon.2024.e38856|anchor=4e4fa158}}. Wild-type hairy root cultures produced hyoscyamine at approximately 54 µg/g dry weight as a baseline reference{{cite|doi=10.1038/s41598-018-36156-y|anchor=4a6905db}}.
Total alkaloid content varies substantially by plant part in European strains: leaves contain approximately 0.17%, roots approximately 0.08%, and seeds approximately 0.05%{{cite|pubmed=25386392|anchor=e71b5e0d}}. This variation has direct safety implications — the same mass of leaf material delivers roughly three times the alkaloid load of the same mass of seeds.
Geographic chemotype variation represents the most significant confounding factor for any dose estimation. Egyptian strains contain 0.7–1.5% total alkaloids compared with 0.05–0.17% in European strains — a greater than 10-fold difference{{cite|pubmed=25386392|anchor=1a321f69}}. The same mass of [[glossary:plant-material]] from different geographic origins can therefore differ in alkaloid content by an order of magnitude.
===Minor alkaloids===
Three minor tropane alkaloids have been confirmed in ''H. niger''. '''Anisodamine''' has been identified by HPLC{{cite|doi=10.1007/s10529-013-1426-9|anchor=f05a6cea}}{{cite|pubmed=29911833|anchor=eefc581f}}. '''Cuscohygrine''' occurs primarily in roots, reaching 26.5 mg/g dry weight in hairy root bioreactor cultures{{cite|doi=10.1007/s10529-013-1426-9|anchor=ddd8470e}}. '''Apoatropine''' is present in whole-plant preparations{{cite|pubmed=25386392|anchor=f4b7f8ef}}. The pharmacological contribution of these minor constituents to whole-plant effects in humans is poorly characterized in published literature.
===Biosynthesis===
Tropane alkaloid biosynthesis in ''H. niger'' proceeds from ornithine and arginine through putrescine, N-methylputrescine, and tropinone to hyoscyamine, which is then converted to scopolamine via 6β-hydroxyhyoscyamine. The terminal step is catalyzed by hyoscyamine 6β-hydroxylase (H6H), a 2-oxoglutarate-dependent dioxygenase first purified and characterized from ''H. niger'' root cultures{{cite|pubmed=3569262|anchor=2f2312e3}}. The aromatic [[substance_class:chemical/amino-acid]] aminotransferase HnArAT3 provides phenyllactic acid for the esterification step in the pathway{{cite|pubmed=29911833|anchor=071230c8}}. Alkaloid [[glossary:synthesis]] occurs primarily in roots, with transport to and [[glossary:accumulation]] in leaves{{cite|pubmed=3569262|anchor=e6ab2225}}. The complete biosynthetic pathway from amino acid precursors to scopolamine has been reconstructed in yeast, confirming each enzymatic step{{cite|doi=10.1038/s41586-020-2650-9|anchor=1301a46b}}.
===Preparation effects on alkaloid ratios===
Aqueous extraction (tea preparation) extracts both alkaloids, as scopolamine and hyoscyamine are water-soluble; relative ratios are maintained but absolute yield depends on pH and temperature. Methanol extraction under different conditions differentially favors each alkaloid: 100% methanol at 45°C with ultrasound optimizes hyoscyamine yield, while approximately 98.5% methanol at 25°C optimizes scopolamine recovery{{cite|doi=10.1016/j.heliyon.2024.e38856|anchor=f5846399}}. No published quantitative data exist on alkaloid yield from smoking ''H. niger'' specifically, though pyrolysis is known to partially degrade tropane alkaloids. Unlike [[substance:cannabis]] [[substance_class:psychoactive/cannabinoid|cannabinoids]], tropane alkaloids do not require thermal [[glossary:activation]] — they are pharmacologically active in the native plant matrix.
The psychoactive and toxic properties of ''H. niger'' are driven by two [[substance_class:chemical/tropane]] alkaloids: [[substance:scopolamine]] (hyoscine) and hyoscyamine. Both are [[substance_class:pharmacological/muscarinic-acetylcholine-receptor-antagonist|muscarinic acetylcholine receptor antagonists]], but they differ sharply in their central-to-peripheral effect balance{{cite|doi=10.1007/s13659-022-00357-w|anchor=1b6c2509}}. Scopolamine crosses the [[glossary:blood-brain-barrier]] more readily and is responsible for the [[effect:sedation]], [[effect:amnesia]], and [[effect:delirium]] that characterize henbane [[glossary:intoxication]]. Hyoscyamine — whose [[glossary:racemic-mixture]] form is the pharmaceutical agent atropine — exerts predominantly peripheral effects at lower doses, with central effects emerging only at higher concentrations{{cite|doi=10.1007/s13659-022-00357-w|anchor=3c0b89a6}}{{cite|pubmed=25386392|anchor=1a67bcdc}}.
The ratio of scopolamine to hyoscyamine in ''H. niger'' varies substantially with plant part, geographic origin, and growing conditions. Alkaloid content can differ more than 10-fold between European and Egyptian populations{{cite|pubmed=25386392|anchor=7f791889}}, making this variability the single most important factor rendering dose prediction from crude [[glossary:plant-material]] clinically unreliable. Seeds and roots generally carry the highest alkaloid concentrations, while leaves and flowers contain lower but pharmacologically active quantities.
Minor tropane alkaloids present in ''H. niger'' include atroscine and cuscohygrine, though these contribute minimally to the overall pharmacological profile relative to the two dominant alkaloids. The pharmacological significance of these minor constituents in crude preparations has not been systematically studied{{flag|citation-needed}}.
The European Food Safety Authority established a group Acute Reference Dose of '''0.016 µg/kg body weight''' for the sum of hyoscyamine and scopolamine{{cite|doi=10.2903/j.efsa.2013.3386|anchor=4514a85f}}. This threshold is so low that even trace [[glossary:contamination]] of food products with ''H. niger'' seeds can exceed safe exposure limits — particularly for toddlers, where dietary exposure exceeded the ARfD on 11–18% of consumption days in limited EU data{{cite|doi=10.2903/j.efsa.2013.3386|anchor=0bf83849}}.
===Where it acts===
[[substance:scopolamine]] and hyoscyamine block [[glossary:muscarinic-acetylcholine-receptor|muscarinic acetylcholine receptors]] across the central and peripheral nervous system{{cite|doi=10.1007/s13659-022-00357-w|anchor=2c986992}}. In the body's periphery, this produces dilated pupils, [[glossary:tachycardia|rapid heart rate]], dry skin, and suppressed gut motility. In the brain — particularly the [[glossary:cortex]] and [[glossary:hippocampus]] — it disrupts [[substance_class:chemical/cholinergic]] [[glossary:circuit|circuits]], producing the [[effect:sedation]], [[effect:amnesia]], and [[effect:delirium]] that define the ''H. niger'' experience{{cite|pubmed=16175141|anchor=2904d65b}}.
===What it changes===
Scopolamine's [[glossary:disruption]] of hippocampal signaling causes profound anterograde amnesia — users typically retain no memory of events during [[glossary:intoxication]]. At toxic doses, the state shifts from sedation to [[glossary:excited-delirium]] with fully formed visual, auditory, and [[effect:tactile-hallucination|tactile hallucinations]]. Scopolamine is broken down in the liver and crosses both the [[glossary:blood-brain-barrier]] and the placenta{{cite|pubmed=16175141|anchor=b6e8654b}}.
{{DiscoverMore|Open Questions}}
No neuroimaging studies of ''H. niger'' intoxication have been published. How the alkaloids behave in the body after [[glossary:ingestion]] of crude [[glossary:plant-material]] — oral tea, seed ingestion, smoked preparations — remains entirely uncharacterized. The scopolamine-to-hyoscyamine ratio varies across wild populations, but no systematic study has quantified this variation for predicting psychoactive [[glossary:potency]] or [[glossary:toxicity]] risk.
{{/DiscoverMore}}
===Where it acts===
[[substance:scopolamine]] and hyoscyamine block [[glossary:muscarinic-acetylcholine-receptor|muscarinic acetylcholine receptors]] (M1, M2, M3) across both the central and peripheral nervous system{{cite|doi=10.1007/s13659-022-00357-w|anchor=759265a5}}. Peripheral [[glossary:blockade]] produces the physical signs of anticholinergic [[glossary:toxidrome]]: dilated pupils, [[glossary:tachycardia]], dry skin, and suppressed gut motility. Central blockade — driven primarily by scopolamine — disrupts [[substance_class:chemical/cholinergic]] [[glossary:circuit|circuits]] in the [[glossary:cortex]] and [[glossary:hippocampus]], producing the [[effect:sedation]], [[effect:amnesia]], and [[effect:delirium]] that define the ''H. niger'' experience{{cite|pubmed=16175141|anchor=d4e3947a}}.
===What it changes===
Scopolamine's [[glossary:disruption]] of hippocampal cholinergic signaling produces profound anterograde amnesia — users frequently retain no memory of events during [[glossary:intoxication]]. At toxic doses, the balance shifts from sedation to [[glossary:excited-delirium]] with fully formed visual, auditory, and [[effect:tactile-hallucination|tactile hallucinations]]. Scopolamine is metabolized primarily via [[glossary:glucuronidation|glucuronide conjugation]] and [[glossary:cyp3a4]]-mediated oxidative demethylation, and crosses both the [[glossary:blood-brain-barrier]] and the placenta{{cite|pubmed=16175141|anchor=de7784db}}.
{{DiscoverMore|Open Questions}}
No neuroimaging studies of ''H. niger'' intoxication have been published. The [[glossary:pharmacokinetics]] of alkaloids consumed via crude [[glossary:plant-material]] — oral tea, seed [[glossary:ingestion]], smoked preparations — remain entirely uncharacterized. The scopolamine-to-hyoscyamine ratio varies across wild populations, but no comprehensive study has quantified this variability for predicting psychoactive [[glossary:potency]] or [[glossary:toxicity]] risk.
{{/DiscoverMore}}
The experience produced by ''H. niger'' is fundamentally unlike the visionary or introspective states associated with [[glossary:serotonergic-psychedelics]] or [[substance_class:psychoactive/dissociative|dissociatives]]. Anticholinergic [[effect:delirium]] is a non-lucid condition: the user loses all [[glossary:insight]] into being intoxicated, interacts with phantom persons and objects, and cannot distinguish [[glossary:hallucination]] from reality. [[glossary:set-and-setting]] exert minimal moderating influence because the delirious state overrides environmental [[glossary:awareness]]. Preparation type modulates onset and duration but not the fundamental character; the extreme variability in alkaloid content across geographic strains and plant parts is the dominant unpredictable modifier of [[glossary:intensity]].
Among anticholinergic [[substance_class:psychoactive/deliriant|deliriants]], ''H. niger'' is most closely comparable to ''Datura stramonium'' and ''Atropa belladonna'', sharing the same [[substance_class:chemical/tropane]] alkaloid pharmacology and clinical presentation. Its relatively high [[substance:scopolamine]]-to-hyoscyamine ratio produces a more sedative and amnestic profile compared with atropine-dominant species, though all three plants produce the same core anticholinergic syndrome at toxic doses. Reported hallucinations commonly include conversations with absent persons, interaction with non-existent objects, and phantom activities such as cigarette smoking{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=61349316}}.
The experience produced by ''H. niger'' is fundamentally unlike the visionary or introspective states associated with [[glossary:serotonergic-psychedelics]] or [[substance_class:psychoactive/dissociative|dissociatives]]. Anticholinergic [[effect:delirium]] is a non-lucid condition: the person loses all [[glossary:insight]] into being intoxicated, interacts with phantom people and objects, and cannot distinguish [[glossary:hallucination]] from reality. [[glossary:set-and-setting]] exert minimal moderating influence — the delirious state overrides environmental [[glossary:awareness]] entirely. Alkaloid variability across geographic strains and plant parts is the dominant unpredictable modifier of [[glossary:intensity]].
Among anticholinergic [[substance_class:psychoactive/deliriant|deliriants]], ''H. niger'' is most comparable to ''Datura stramonium'' and ''Atropa belladonna'', sharing the same [[substance_class:chemical/tropane]] alkaloid pharmacology and clinical presentation. Henbane's relatively high [[substance:scopolamine]]-to-hyoscyamine ratio produces a more sedative and amnestic profile than atropine-dominant species — though all three plants produce the same core anticholinergic syndrome at toxic doses{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=e2bd1b78}}. Reported hallucinations commonly include conversations with absent persons, interaction with non-existent objects, and phantom activities such as cigarette smoking{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=ee8a23f9}}.
{{Warning}}No safe or intentional dose for [[glossary:human-consumption]] of ''H. niger'' preparations has been established in published clinical or pharmacological literature. The alkaloid content of ''H. niger'' varies more than 10-fold between geographic strains, making dose estimation from [[glossary:plant-material]] clinically unreliable{{cite|pubmed=25386392|anchor=19e7fff9}}. All dose-related data below derive from poisoning [[glossary:case-report|case reports]] and toxicological reviews, not controlled human studies. See the Dose by preparation card for quantitative reference.{{/Warning}}
===Seeds (oral)===
Seeds are the plant part most commonly involved in accidental poisoning, frequently consumed when ''H. niger'' seeds contaminate cereal grains, herbal teas, or buckwheat during harvest and processing{{cite|doi=10.3920/QAS2013.0314|anchor=975d7759}}. Seeds contain approximately 0.05% total alkaloids in European strains{{cite|pubmed=25386392|anchor=b1c12fed}}; however, the small size of individual seeds means that large numbers may be consumed inadvertently. No published threshold dose in seed mass for clinical effects has been established. Onset, peak, and duration data specific to seed [[glossary:ingestion]] are absent from the published literature.
===Leaves and flowers (oral)===
Leaves have the highest total alkaloid percentage by dry weight at approximately 0.17% (European strains){{cite|pubmed=25386392|anchor=1d0420ab}}. Approximately 4 flowers have been reported sufficient to induce clinical anticholinergic manifestations in a pre-school child{{cite|pubmed=25386392|anchor=ba56bdd8}}{{flag|safety-citation-needed}}. One documented case of deliberate henbane flower chewing in an adult resulted in acute anticholinergic poisoning{{cite|pubmed=979798|anchor=2dfeb1c8}}.
Effect onset for oral plant preparations has not been specifically measured; based on purified [[substance:scopolamine]] oral [[glossary:pharmacokinetics]], onset is estimated at approximately 30 minutes{{cite|pubmed=16175141|anchor=a4234fc1}}. Most clinical effects resolve within 24 hours with supportive care; approximately 85% of alkaloids are excreted within that period{{cite|pubmed=25386392|anchor=12bd3b5a}}.
===Tea (aqueous infusion)===
Aqueous infusion of leaves or seeds extracts both scopolamine and hyoscyamine. No quantitative data on alkaloid yield per mass of plant material in tea preparation have been published. [[glossary:contamination]] of commercial herbal teas by ''H. niger'' seeds has been documented as a food safety concern{{cite|doi=10.3920/QAS2013.0314|anchor=87297019}}{{cite|doi=10.2903/j.efsa.2013.3386|anchor=ccf2bc93}}. All pharmacokinetic parameters for this preparation are unknown.
===Smoked or inhaled===
Historical sources document smoking of ''H. niger'' leaves and seeds. No published quantitative data exist on alkaloid yield from combustion of ''H. niger'' specifically. Pyrolysis partially degrades [[substance_class:chemical/tropane]] alkaloids, but scopolamine and hyoscyamine survive partial combustion. Onset, duration, and dose data for smoked preparations are absent from the published literature.
===Transdermal (historical)===
Medieval "flying ointments" applied ''H. niger'' extract to the skin, exploiting transdermal [[glossary:absorption]] of tropane alkaloids{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=27a950dc}}. No quantitative data on transdermal absorption from crude plant preparations exist. For reference, pharmaceutical transdermal scopolamine patches deliver 0.5 mg over 72 hours from a 1.5 mg reservoir{{cite|pubmed=16175141|anchor=34c80475}}.
===Gruit (henbane beer)===
''H. niger'' was added to beer as part of the ''gruit'' herbal mixture in northern European brewing before hops became standard. The composition and alkaloid content of such preparations are not quantified in published literature. The Bavarian Purity Law of 1516 effectively prohibited this use{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=50c42141}}.
===Key effect modifiers===
* '''Geographic strain:''' Egyptian ''H. niger'' (0.7–1.5% total alkaloids) may be more than 10 times as potent as European strains (0.05–0.17%){{cite|pubmed=25386392|anchor=e422fe9e}}
* '''Plant part:''' Leaves > roots > seeds by alkaloid percentage of dry weight{{cite|pubmed=25386392|anchor=9f74eeb8}}
* '''Age of individual:''' Children are substantially more sensitive to anticholinergic effects{{cite|pubmed=25386392|anchor=85a795e1}}
* '''Concurrent anticholinergic medications:''' [[glossary:additive-effects]] dramatically lower the threshold for [[glossary:toxicity]]
* '''Individual CYP3A4 activity:''' Affects scopolamine [[glossary:clearance]] rate{{cite|pubmed=16175141|anchor=91428175}}
''H. niger'' has been consumed historically as seeds, leaves, flowers, root material, smoked preparations, and transdermal ointments. No preparation has an established safe dose. All dose information below is derived from historical [[glossary:case-report|case reports]] and ethnobotanical accounts, not from controlled studies. Alkaloid content varies enormously by plant part, geographic strain, and growing conditions — any stated [[glossary:dose-range]] carries extreme uncertainty{{cite|pubmed=25386392|anchor=5acec532}}.
====Seeds (oral)====
'''Seeds''' are the plant part most commonly involved in both accidental and deliberate poisonings. They carry among the highest alkaloid concentrations of any tissue and are easily mistaken for poppy or mustard seeds{{cite|doi=10.2903/j.efsa.2013.3386|anchor=8d93bb08}}. Historical reports indicate that as few as 10–20 seeds have produced clinical anticholinergic syndrome in adults, though the threshold varies widely with strain{{flag|safety-citation-needed}}. Onset is typically 30–60 minutes after [[glossary:ingestion]], with effects lasting 12–24 hours or longer{{cite|pubmed=25386392|anchor=a65b97fc}}. Seeds have entered the food supply via [[glossary:contamination]] of cereal grains, herbal teas, and linseed during harvest and processing{{cite|doi=10.3920/QAS2013.0314|anchor=619de0a8}}.
====Leaf and flower (oral)====
'''Leaves and flowers''' contain lower alkaloid concentrations than seeds but remain pharmacologically active. Historical consumption includes direct chewing of fresh material, dried leaf infusions, and incorporation into food. In children, as few as 4 flowers have caused clinical poisoning{{cite|pubmed=25386392|anchor=face0d9d}}{{flag|safety-citation-needed}}. Onset and duration are comparable to seed ingestion when consumed orally. A 1976 Australian case report documented deliberate chewing of henbane flowers, noting more widespread use than clinical reports suggested{{cite|pubmed=979798|anchor=4bca3a65}}.
====Smoked (leaf or flower)====
'''Smoking''' dried ''H. niger'' leaf or flower material produces faster onset (within minutes) and shorter duration compared with oral preparations, though clinical data are sparse. This route was documented historically for toothache relief — the smoke was directed into the oral cavity — and for psychoactive use{{flag|citation-needed}}. Dose titration is somewhat easier than with oral preparations due to the shorter onset window, but alkaloid variability between batches still makes predictable dosing impossible.
====Transdermal ointment====
'''Transdermal ointments''' represent the preparation most associated with medieval European witchcraft practices. Henbane was combined with other Solanaceae (''Atropa belladonna'', ''Mandragora officinarum'') in fat-based preparations applied to thin-skinned areas{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=af8e5363}}. Transdermal [[glossary:absorption]] produces a slower, more gradual onset than oral ingestion. No quantitative dose or pharmacokinetic data exist for this preparation form.
Per-preparation dose tiers, timelines, and [[glossary:bioavailability]] data — where available — are in the Dose · by preparation card on this page.
====Toxicity====
''H. niger'' is a '''highly toxic plant''' — every part contains pharmacologically active [[substance_class:chemical/tropane]] alkaloids{{cite|pubmed=25386392|anchor=51bd3e6c}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=7516de07}}. The European Food Safety Authority's Acute Reference Dose for these alkaloids is '''0.016 µg/kg body weight'''{{cite|doi=10.2903/j.efsa.2013.3386|anchor=cb228598}} — so low that trace food [[glossary:contamination]] can exceed it.
Acute poisoning presents as full anticholinergic syndrome. In published clinical series: [[effect:pupil-dilation]] in 94.8% of cases, [[effect:restlessness]] in 89.5%, and [[glossary:hallucination|hallucinations]] in 89.5%{{cite|pubmed=25386392|anchor=5e65dad8}}. Additional features include [[glossary:tachycardia]], [[effect:dry-mouth]], warm flushed skin, [[glossary:hyperthermia]], urinary retention, and [[effect:confusion]]. Severe cases progress to [[glossary:arrhythmia]], [[glossary:seizure|convulsions]], and coma{{cite|pubmed=25386392|anchor=33dad592}}.
All psychoactive effects occur at doses that overlap with the toxic range. No sub-toxic psychoactive threshold has been established{{cite|pubmed=25386392|anchor=aa4f277f}}.
'''Contaminant and food safety risk:''' Seeds enter cereal grains, herbal teas, and linseed during harvest and processing{{cite|doi=10.3920/QAS2013.0314|anchor=9b876b72}}. Toddler dietary exposure could exceed the group ARfD on 11–18% of consumption days in EU data{{cite|doi=10.2903/j.efsa.2013.3386|anchor=08434830}}. For deliberately obtained [[glossary:plant-material]], '''intra-batch alkaloid variability''' — driven by geographic origin, growing conditions, and plant part — is the primary safety variable. No ISO/IEC-accredited lab testing exists for ''H. niger'' sold in commerce.
'''Vulnerable populations:'''
* '''Children:''' Substantially more sensitive to anticholinergic effects; as few as 4 flowers may cause clinical poisoning{{cite|pubmed=25386392|anchor=5f6d29ce}}{{flag|safety-citation-needed}}
* '''Elderly:''' Heightened anticholinergic [[glossary:sensitivity]]; long-term exposure associated with increased dementia risk{{cite|doi=10.1111/jnc.15244|anchor=5cf93a6e}}
* '''Pregnant individuals:''' [[substance:scopolamine]] crosses the placenta; use without clinical supervision is contraindicated{{cite|pubmed=16175141|anchor=4f935b0b}}
* '''Hepatic impairment:''' May reduce alkaloid [[glossary:metabolism]]; no ''H. niger''-specific data available
====Psychological Risks====
The primary psychoactive effect at any dose achievable from plant material is '''delirium''' — an agitated, non-lucid state with hallucinations and confusion that cannot be voluntarily controlled{{cite|pubmed=25386392|anchor=d02705d7}}. This is pharmacologically and experientially distinct from the hallucinatory states produced by [[glossary:serotonergic-psychedelics]].
Reality testing is severely impaired. A person in anticholinergic [[effect:delirium]] may act on hallucinations with risk of [[glossary:self-harm]], falls, or injury from [[effect:spatial-disorientation]]. Reported hallucinations commonly include conversations with absent persons and interaction with non-existent objects{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=aab92365}}.
Anticholinergic delirium may precipitate or worsen [[glossary:psychotic-episodes]] in psychiatrically predisposed individuals{{flag|citation-needed}}.
====Tolerance & Dependence====
Published data on [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] specific to ''H. niger'' — outside pharmaceutical contexts — are '''absent from the literature'''. Scopolamine is classified as non-addictive in pharmaceutical use and is [[glossary:unscheduled|not scheduled]] for [[glossary:abuse-potential]] in most jurisdictions. The aversive nature of anticholinergic delirium strongly limits voluntary repeat use{{cite|doi=10.1371/journal.pone.0247688|anchor=22df5f09}}.
====Drug Interactions====
'''CYP3A4 inhibitors''' slow scopolamine breakdown, increasing its concentration in the body. [[glossary:grapefruit-juice]] alone raised scopolamine blood levels to approximately 142% of control values{{cite|pubmed=16175141|anchor=e2574c89}}. Drugs including '''ketoconazole''', '''erythromycin''', and '''HIV protease inhibitors''' would produce a similar or stronger effect.
The most clinically dangerous interaction class is '''additive anticholinergic burden'''{{cite|doi=10.3389/fphar.2012.00069|anchor=e4035890}}:
* '''Tricyclic antidepressants''' (amitriptyline, imipramine): strong [[glossary:additive-effects|additive risk]] for delirium, urinary retention, and hyperthermia
* '''First-generation antihistamines''' ([[substance:diphenhydramine]], hydroxyzine): additive anticholinergic effects
* '''Antipsychotics''' ([[substance_class:chemical/phenothiazine|phenothiazines]], clozapine): additional anticholinergic burden
* '''Benzodiazepines and alcohol:''' additive [[glossary:central-nervous-system|CNS]] [[effect:sedation]] with scopolamine
'''Physostigmine''' reverses severe anticholinergic delirium. A randomized trial found it superior to [[substance:lorazepam]] for antimuscarinic [[glossary:toxidrome]]{{cite|doi=10.1080/15563650.2020.1854281|anchor=f177b925}}, a prospective poison-center study confirmed its superiority over non-antidote therapy{{cite|doi=10.1080/15563650.2018.1485154|anchor=5af3407a}}, and a retrospective analysis of 815 patients found it associated with lower intubation rates (1.9% vs 8.4%){{cite|doi=10.1007/s13181-014-0452-x|anchor=f921319c}}.
====Contraindications====
'''Absolute contraindications:'''
* '''Concurrent anticholinergic medication:''' Tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], first-generation antihistamines, and [[substance_class:psychoactive/antipsychotic|antipsychotics]] with anticholinergic properties create additive burden that substantially lowers the [[glossary:toxicity]] threshold
* '''Pregnancy:''' Scopolamine crosses the placenta; any exposure requires clinical supervision{{cite|pubmed=16175141|anchor=1275b368}}
* '''Children:''' Substantially heightened sensitivity to anticholinergic effects{{cite|pubmed=25386392|anchor=f1c88138}}
'''Relative contraindications:'''
* '''Cardiac conditions:''' Anticholinergic-induced tachycardia and arrhythmia pose elevated risk in pre-existing cardiac disease
* '''Urinary retention or prostatic hypertrophy:''' Muscarinic [[glossary:blockade]] worsens urinary retention
* '''Angle-closure glaucoma:''' Mydriasis may [[glossary:trigger]] acute angle-closure crisis
* '''Hepatic impairment:''' Slower scopolamine [[glossary:clearance]] prolongs and intensifies effects
* '''Psychiatric history (psychotic spectrum):''' Anticholinergic delirium may precipitate or worsen psychotic episodes{{flag|citation-needed}}
* '''Elderly:''' Age-related anticholinergic sensitivity; long-term exposure associated with dementia risk{{cite|doi=10.1111/jnc.15244|anchor=d33776fe}}
===Detection===
Standard immunoassay drug panels do not detect scopolamine or hyoscyamine{{cite|pubmed=18787311|anchor=95b6abd0}}. LC-MS/MS can detect both in serum and urine but requires a specific request for tropane alkaloid screening. In a documented [[glossary:drug-facilitated-sexual-assault|drug-facilitated assault]] case, scopolamine was detected in urine at 41 µg/L at 18 hours post-exposure and in hair at 5 weeks post-exposure; blood was negative at 18 hours{{cite|doi=10.1016/j.forsciint.2023.111678|anchor=ef4b5a12}}.
{{Emergency}}Acute ''H. niger'' poisoning requires emergency medical attention. Management: (1) supportive care as the mainstay; (2) activated charcoal if [[glossary:ingestion]] was recent and [[glossary:airway]] is protected — not ipecac{{cite|pubmed=25386392|anchor=827026e7}}; (3) [[substance_class:chemical/benzodiazepine|benzodiazepines]] for [[glossary:agitation]] and seizure prevention; (4) physostigmine for severe anticholinergic delirium{{cite|doi=10.1080/15563650.2020.1854281|anchor=a54c06a5}}{{cite|doi=10.1080/15563650.2018.1485154|anchor=bc7b008e}}; (5) active temperature management for hyperthermia; (6) cardiac monitoring for arrhythmia. Approximately 85% of alkaloids are excreted within 24 hours{{cite|pubmed=25386392|anchor=e5287b69}}.
Poison Control Center (US): 1-800-222-1222{{/Emergency}}
''H. niger'' has been consumed historically as seeds, leaves, flowers, root material, smoked preparations, and transdermal ointments. No preparation has an established safe dose. All dose information below derives from historical [[glossary:case-report|case reports]] and ethnobotanical accounts, not controlled studies. Alkaloid content varies enormously by plant part, geographic strain, and growing conditions{{cite|pubmed=25386392|anchor=6e748397}}.
====Seeds (oral)====
'''Seeds''' carry the highest alkaloid concentrations of any plant tissue and are easily mistaken for poppy or mustard seeds{{cite|doi=10.2903/j.efsa.2013.3386|anchor=9710fe58}}. Historical reports indicate as few as 10–20 seeds have caused clinical anticholinergic syndrome in adults, though the threshold varies widely with strain{{flag|safety-citation-needed}}. Onset is typically 30–60 minutes after [[glossary:ingestion]]; effects last 12–24 hours or longer{{cite|pubmed=25386392|anchor=228bf123}}. Seeds have entered the food supply via [[glossary:contamination]] of cereal grains, herbal teas, and linseed during harvest and processing{{cite|doi=10.3920/QAS2013.0314|anchor=8aae047a}}.
====Leaf and flower (oral)====
'''Leaves and flowers''' contain lower alkaloid concentrations than seeds but remain pharmacologically active. In children, as few as 4 flowers have caused clinical poisoning{{cite|pubmed=25386392|anchor=780e04ea}}{{flag|safety-citation-needed}}. Historical use includes direct chewing of fresh material, dried leaf infusions, and incorporation into food. A 1976 Australian case report documented deliberate chewing of henbane flowers{{cite|pubmed=979798|anchor=340c53e1}}. Onset and duration are comparable to seed ingestion when consumed orally.
====Smoked (leaf or flower)====
'''Smoking''' dried ''H. niger'' leaf or flower produces faster onset — within minutes — and shorter duration than oral preparations, though clinical data are sparse{{flag|citation-needed}}. This route was documented historically for toothache relief, with smoke directed into the oral cavity. Dose titration is somewhat easier due to the shorter onset window, but alkaloid variability between batches still makes predictable dosing impossible.
====Transdermal ointment====
'''Transdermal ointments''' are the preparation most associated with medieval European witchcraft. Henbane was combined with other Solanaceae in fat-based preparations applied to thin-skinned areas{{cite|name=usda-henbane-ethnobotany|type=web|author=USDA Forest Service|year=2020|title=The Powerful Solanaceae: Henbane|anchor=af1a101a}}. Transdermal [[glossary:absorption]] produces slower, more gradual onset than oral ingestion. No quantitative dose or pharmacokinetic data exist for this preparation form.
Per-preparation dose tiers, timelines, and [[glossary:bioavailability]] data — where available — are in the Dose · by preparation card on this page.
====Toxicity====
''H. niger'' is a '''highly toxic plant'''; all parts — leaves, seeds, flowers, and roots — contain pharmacologically active [[substance_class:chemical/tropane]] alkaloids{{cite|pubmed=25386392|anchor=231ded4c}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=4128c99d}}. No published [[glossary:lethal-dose|LD₅₀]] data for whole [[glossary:plant-material]] in humans exist. The EFSA group Acute Reference Dose for tropane alkaloids is '''0.016 µg/kg body weight'''{{cite|doi=10.2903/j.efsa.2013.3386|anchor=a6152532}} — a threshold so low that trace food [[glossary:contamination]] can exceed it.
Acute poisoning presents as full anticholinergic syndrome. In published clinical series: [[effect:pupil-dilation]] in 94.8% of cases, [[effect:restlessness]] in 89.5%, and [[glossary:hallucination|hallucinations]] in 89.5%{{cite|pubmed=25386392|anchor=edd01a49}}. Additional features include [[glossary:tachycardia]], [[effect:dry-mouth]], warm flushed skin, [[glossary:hyperthermia]], urinary retention, [[effect:confusion]], and combative behaviour. Severe cases progress to [[glossary:arrhythmia]], [[glossary:seizure|convulsions]], and coma{{cite|pubmed=25386392|anchor=42f23dbf}}.
All psychoactive effects occur at doses that overlap with the toxic range; no sub-toxic psychoactive threshold has been established{{cite|pubmed=25386392|anchor=87eddd0a}}.
'''Contaminant and food safety risk:''' The primary contamination vector is food supply contamination — seeds enter cereal grains, herbal teas, edible flowers, beans, and linseed during harvest and processing{{cite|doi=10.3920/QAS2013.0314|anchor=7ac42f8b}}. EFSA found that toddler dietary exposure could exceed the group ARfD on 11–18% of consumption days{{cite|doi=10.2903/j.efsa.2013.3386|anchor=1b2b9c0d}}. No regulatory maximum limits for tropane alkaloids in food had been established at the time of the 2013 EFSA opinion{{cite|doi=10.2903/j.efsa.2013.3386|anchor=172c2c20}}. For deliberately obtained plant material, '''intra-batch alkaloid variability''' — driven by geographic origin, growing conditions, and plant part — is the primary safety variable. No ISO/IEC-accredited laboratory testing or Certificate of Analysis requirement exists for ''H. niger'' sold in commerce.
'''Vulnerable populations:'''
* '''Children:''' Substantially more sensitive to anticholinergic effects; as few as 4 flowers may cause clinical poisoning{{cite|pubmed=25386392|anchor=826ddfa0}}{{flag|safety-citation-needed}}
* '''Elderly:''' Heightened anticholinergic [[glossary:sensitivity]] with elevated [[effect:delirium]] risk; long-term anticholinergic exposure is associated with increased dementia risk{{cite|doi=10.1111/jnc.15244|anchor=c832e967}}
* '''Pregnant individuals:''' [[substance:scopolamine]] crosses the placenta; use without clinical supervision is contraindicated{{cite|pubmed=16175141|anchor=1e4860fa}}
* '''Hepatic impairment:''' May reduce alkaloid [[glossary:metabolism]] via [[glossary:cyp3a4]]; no ''H. niger''-specific data available
====Psychological Risks====
The primary psychoactive effect of ''H. niger'' at doses achievable from plant material is '''delirium''' — an agitated, non-lucid state with hallucinations and confusion that is not voluntarily controllable{{cite|pubmed=25386392|anchor=e8cb86ce}}. This is pharmacologically and experientially distinct from the hallucinatory states produced by [[glossary:serotonergic-psychedelics]].
'''Reality testing is severely impaired.''' Individuals may act on [[effect:delusions]] with risk of [[glossary:self-harm]], falls, or injury from [[effect:spatial-disorientation]]. Reported hallucinations commonly include conversations with absent persons, interaction with non-existent objects, and phantom activities{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=bc2f9c1f}}.
Anticholinergic delirium may precipitate or exacerbate [[glossary:psychotic-episodes]] in psychiatrically predisposed individuals{{flag|citation-needed}}.
====Tolerance & Dependence====
Published data on [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] specific to ''H. niger'' or its alkaloids in a non-pharmaceutical context are '''absent from the literature'''. No tolerance studies for chronic scopolamine or hyoscyamine consumption outside pharmaceutical contexts have been published. No [[glossary:abuse-liability]] studies exist, and no withdrawal syndrome has been documented.
Scopolamine is classified as a non-addictive agent in pharmaceutical use and is [[glossary:unscheduled|not scheduled]] based on [[glossary:abuse-potential]] in most jurisdictions. The unpleasant and often terrifying nature of anticholinergic delirium strongly limits voluntary repeat use{{cite|doi=10.1371/journal.pone.0247688|anchor=c3bdd24c}}.
====Drug Interactions====
'''CYP3A4 inhibitors''' increase scopolamine exposure. Co-administration with [[glossary:grapefruit-juice]] increased scopolamine AUC₀₋₂₄ to approximately 142% of control values, and oral [[glossary:bioavailability]] rose from the 3–27% range to 6–37%{{cite|pubmed=16175141|anchor=0b0b71f3}}. Any CYP3A4 [[glossary:inhibitor]] — including '''ketoconazole''', '''erythromycin''', and '''HIV protease inhibitors''' — would be expected to produce a similar effect.
'''Additive anticholinergic burden''' is the most clinically dangerous interaction class. The following [[glossary:medication]] categories carry anticholinergic properties that are additive with ''H. niger'' alkaloids{{cite|doi=10.3389/fphar.2012.00069|anchor=2561375d}}:
* '''Tricyclic antidepressants''' (amitriptyline, imipramine): strong anticholinergic properties; [[glossary:additive-effects|additive risk]] for delirium, urinary retention, and hyperthermia
* '''First-generation antihistamines''' ([[substance:diphenhydramine]], hydroxyzine): additive anticholinergic effects
* '''Antipsychotics''' ([[substance_class:chemical/phenothiazine|phenothiazines]], clozapine): additional anticholinergic burden
* '''Benzodiazepines and alcohol:''' additive [[glossary:central-nervous-system|CNS]] [[effect:depression]] with scopolamine's sedative effects
'''Physostigmine''' (a cholinesterase inhibitor) reverses severe anticholinergic delirium. A randomized trial found physostigmine superior to [[substance:lorazepam]] for antimuscarinic [[glossary:toxidrome]]{{cite|doi=10.1080/15563650.2020.1854281|anchor=f6705c1c}}, and a prospective poison-center study confirmed its superiority over non-antidote therapy{{cite|doi=10.1080/15563650.2018.1485154|anchor=ecb1e138}}. A retrospective analysis of 815 patients found physostigmine associated with lower intubation rates (1.9% vs 8.4%){{cite|doi=10.1007/s13181-014-0452-x|anchor=29ecfad5}}.
====Contraindications====
'''Absolute contraindications:'''
* '''Concurrent anticholinergic medication use:''' Tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], first-generation antihistamines, [[substance_class:psychoactive/antipsychotic|antipsychotics]] with anticholinergic properties, and antiparkinsonian anticholinergics create additive anticholinergic burden that substantially lowers the [[glossary:toxicity]] threshold
* '''Pregnancy:''' Scopolamine crosses the placenta; teratogenicity data are limited but clinical supervision is required for any exposure{{cite|pubmed=16175141|anchor=38743e27}}
* '''Pediatric exposure:''' Children demonstrate substantially heightened sensitivity to anticholinergic effects{{cite|pubmed=25386392|anchor=d8f6325a}}
'''Relative contraindications:'''
* '''Cardiac conditions:''' Anticholinergic-induced tachycardia and potential arrhythmia pose elevated risk in pre-existing cardiac disease
* '''Urinary retention or prostatic hypertrophy:''' Muscarinic [[glossary:blockade]] exacerbates urinary retention
* '''Angle-closure glaucoma:''' Mydriasis may precipitate acute angle-closure crisis
* '''Hepatic impairment:''' Reduced CYP3A4 capacity may slow scopolamine [[glossary:clearance]], prolonging and intensifying effects
* '''Psychiatric history (psychotic spectrum disorders):''' Anticholinergic delirium may precipitate or worsen psychotic episodes{{flag|citation-needed}}
* '''Elderly:''' Age-related increase in anticholinergic sensitivity; long-term exposure associated with dementia risk{{cite|doi=10.1111/jnc.15244|anchor=528138ae}}
===Detection===
Standard immunoassay drug panels do not detect scopolamine or hyoscyamine — these alkaloids are not included in routine urine drug screens{{cite|pubmed=18787311|anchor=4f1b1af1}}. LC-MS/MS can detect both in serum and urine, but requires a specific laboratory request for tropane alkaloid screening. In a [[glossary:drug-facilitated-sexual-assault|drug-facilitated assault]] case, scopolamine was detected in urine at 41 µg/L at 18 hours post-exposure and in hair at 5 weeks post-exposure; blood was negative at 18 hours{{cite|doi=10.1016/j.forsciint.2023.111678|anchor=42ba3798}}.
{{Emergency}}Acute ''H. niger'' poisoning requires emergency medical attention. Management: (1) supportive care as the mainstay; (2) activated charcoal if [[glossary:ingestion]] was recent and [[glossary:airway]] is protected — not ipecac{{cite|pubmed=25386392|anchor=14fa5408}}; (3) [[substance_class:chemical/benzodiazepine|benzodiazepines]] for [[glossary:agitation]] and seizure prevention; (4) physostigmine for severe anticholinergic delirium{{cite|doi=10.1080/15563650.2020.1854281|anchor=d6f17ddd}}{{cite|doi=10.1080/15563650.2018.1485154|anchor=072a9ad6}}; (5) active temperature management for hyperthermia; (6) cardiac monitoring for arrhythmia. Approximately 85% of alkaloids are excreted within 24 hours{{cite|pubmed=25386392|anchor=3b67f102}}.
Poison Control Center (US): 1-800-222-1222{{/Emergency}}
===Forms & Identification===
''H. niger'' preparations are not sold through regulated markets in any jurisdiction. [[glossary:plant-material]] obtained in the wild or through informal [[glossary:channel|channels]] carries no quality controls, no standardized alkaloid content, and no third-party testing. No Certificate of Analysis infrastructure or ISO-accredited lab testing program exists for henbane products.
Alkaloid concentration varies enormously: seeds carry the highest concentrations, leaves lower — and populations differ by up to 10-fold between geographic strains. A prior dose that produced a given effect from one batch is not a reliable guide for a subsequent batch from different plant material.
===Set & Setting===
Anticholinergic [[effect:delirium]] overrides environmental [[glossary:awareness]] entirely. [[glossary:set-and-setting]] exert far less moderating influence than with [[glossary:serotonergic-psychedelics]] or [[substance:cannabis]] — the non-lucid, agitated state means rational decision-making is impossible during [[glossary:intoxication]].
If exposure occurs, the single most important environmental factor is a sober, physically capable [[glossary:sitter]] prepared to prevent [[glossary:self-harm]] and call emergency services. An indoor space with locked doors and no access to heights, roadways, or water is essential. Remove sharp objects, [[glossary:medication|medications]], and car keys from the space.
===Guidelines===
{{Guideline}}
* '''This plant has no established safe dose for any preparation.''' The margin between psychoactive and life-threatening effects is narrow and unpredictable. Psychedex does not recommend intentional consumption of ''H. niger'' in any form.
* If exposure occurs despite this warning: never use alone. A sober, informed sitter is not optional — it is the minimum threshold for survivable use.
* Do not combine ''H. niger'' with any anticholinergic medication (tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], [[substance:diphenhydramine]], hydroxyzine, [[substance_class:psychoactive/antipsychotic|antipsychotics]]), [[substance_class:chemical/benzodiazepine|benzodiazepines]], or [[substance:alcohol]].
* Do not consume material from an unfamiliar plant batch without first testing a much smaller amount and waiting at least 2 hours to assess response. Even this does not guarantee safety due to intra-batch alkaloid variation.
* Inform a trusted person outside the space of what has been consumed, the approximate amount, and the time. Provide the Poison Control number: 1-800-222-1222 (US).
* Hydrate actively. Anticholinergic effects suppress sweating and increase [[glossary:hyperthermia]] risk.
* Keep ambient temperature cool. Monitor for flushed, dry skin — an early sign of anticholinergic [[glossary:toxidrome]].
{{/Guideline}}
===Emergency Response===
{{Emergency}}
'''Recognizing an emergency:'''
* Severely dilated pupils unresponsive to light
* Hot, dry, flushed skin with absence of sweating
* [[glossary:heart-rate]] above 120 bpm or irregular heartbeat
* [[glossary:excited-delirium|Agitated delirium]]: [[effect:confusion]], combativeness, inability to recognize surroundings or people
* [[glossary:seizure|Seizures]], [[glossary:loss-of-consciousness]], or inability to be roused
* Urinary retention or complete inability to urinate
'''Immediate steps:'''
* 1. Call emergency services (911 in US, 112 in EU, 000 in Australia).
* 2. Do not leave the person alone. Prevent self-injury — restrain gently if necessary.
* 3. Move to a cool environment. Apply cool, wet cloths to skin if hyperthermia is suspected.
* 4. Do not induce [[effect:vomiting]]. Do not administer ipecac.
* 5. If the person is unconscious, place in the [[glossary:recovery-position]] to protect the [[glossary:airway]].
'''What to tell the dispatcher:''' "Possible henbane / anticholinergic plant poisoning. [[substance_class:chemical/tropane]] alkaloid exposure — [[substance:scopolamine]] and hyoscyamine." State the preparation consumed (seeds, leaves, tea), estimated amount, time of [[glossary:ingestion]], and current symptoms.
'''Reversal agent:''' Physostigmine is the specific antidote for severe anticholinergic toxidrome, administered only by medical professionals in a monitored setting. It is not available over the counter.
[[glossary:good-samaritan-law|Good Samaritan laws]] exist in many US states and other jurisdictions, providing legal protection for individuals who call emergency services to report a drug-related medical emergency.
{{/Emergency}}
===Aftercare & Integration===
{{Aftercare}}
Anticholinergic delirium typically resolves within 24 hours, with approximately 85% of alkaloids excreted in that period. Post-experience effects may include persistent [[effect:dry-mouth]], [[effect:visual-acuity-suppression]], urinary difficulty, cognitive fog, and [[glossary:fatigue]] lasting 24–48 hours.
Rehydrate aggressively — anticholinergic effects suppress normal fluid regulation. Eat bland, easily digested food when appetite returns. Rest in a low-[[effect:stimulation]] environment.
Anterograde [[effect:amnesia]] is expected: the person may have no memory of events during intoxication. A sitter's account of what occurred can help process the experience. If persistent confusion, visual [[glossary:disturbance|disturbances]], or psychological [[glossary:distress]] continue beyond 48 hours, seek medical evaluation.
{{/Aftercare}}
===Recovery & Support===
{{Recovery}}
Compulsive repeat use of ''H. niger'' is rare due to the aversive nature of anticholinergic delirium. No formal [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] data exist, and no substance-specific cessation protocols have been developed.
If persistent psychological distress, [[effect:flashbacks]], or [[effect:anxiety]] follow a henbane experience, standard trauma-informed counselling and psychiatric evaluation are appropriate.
'''Crisis and support resources:'''
* '''SAMHSA National Helpline''' (US): 1-800-662-4357 (free, confidential, 24/7)
* '''Poison Control''' (US): 1-800-222-1222
* '''Crisis Text Line''' (US): Text HOME to 741741
* '''Samaritans''' (UK): 116 123
{{/Recovery}}
===Forms & Identification===
''H. niger'' preparations are not sold through regulated markets in any jurisdiction. [[glossary:plant-material]] obtained in the wild or through informal [[glossary:channel|channels]] carries no quality controls, no standardized alkaloid content, and no third-party testing. Unlike [[substance:cannabis]] or [[substance:kratom]], no Certificate of Analysis infrastructure or ISO-accredited lab testing program exists for henbane products.
Alkaloid concentration varies enormously by plant part (seeds highest, leaves lower), geographic strain (10-fold variation between populations), and growing conditions. This means that even experienced users of crude plant material cannot reliably predict [[glossary:potency]] from one batch to the next. Any prior dose that produced a given effect is not a reliable guide for subsequent use from different plant material.
===Set & Setting===
Anticholinergic [[effect:delirium]] overrides environmental [[glossary:awareness]] — [[glossary:set-and-setting]] exert far less moderating influence than with [[glossary:serotonergic-psychedelics]] or cannabis. The non-lucid, agitated state means the user cannot make rational decisions during [[glossary:intoxication]] and may act on [[glossary:hallucination|hallucinations]] with risk of injury.
If exposure occurs, the single most important environmental factor is the presence of a sober, physically capable [[glossary:sitter]] who is prepared to restrain the user from [[glossary:self-harm]] and to call emergency services. An indoor environment with locked doors and no access to heights, roadways, or water is essential. Remove sharp objects, [[glossary:medication|medications]], and car keys from the space.
===Guidelines===
{{Guideline}}
* '''This plant has no established safe dose for any preparation.''' The margin between psychoactive and life-threatening effects is narrow and unpredictable. Psychedex does not recommend intentional consumption of ''H. niger'' in any form.
* If exposure occurs despite this warning: never use alone. A sober, informed sitter is not optional — it is the minimum threshold for survivable use.
* Do not combine ''H. niger'' with any anticholinergic medication (tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], [[substance:diphenhydramine]], hydroxyzine, [[substance_class:psychoactive/antipsychotic|antipsychotics]]), [[substance_class:chemical/benzodiazepine|benzodiazepines]], or [[substance:alcohol]].
* Do not consume material from an unfamiliar plant batch without first testing a much smaller amount and waiting at least 2 hours to assess response. Even this does not guarantee safety due to intra-batch alkaloid variation.
* Inform a trusted person outside the space of what has been consumed, the approximate amount, and the time. Provide the Poison Control number: 1-800-222-1222 (US).
* Hydrate actively. Anticholinergic effects suppress sweating and increase [[glossary:hyperthermia]] risk.
* Keep ambient temperature cool. Monitor for flushed, dry skin — an early sign of anticholinergic [[glossary:toxidrome]].
{{/Guideline}}
===Emergency Response===
{{Emergency}}
'''Recognizing an emergency:'''
* Severely dilated pupils unresponsive to light
* Hot, dry, flushed skin with absence of sweating
* [[glossary:heart-rate]] above 120 bpm or irregular heartbeat
* [[glossary:excited-delirium|Agitated delirium]]: [[effect:confusion]], combativeness, inability to recognize surroundings or people
* [[glossary:seizure|Seizures]], [[glossary:loss-of-consciousness]], or inability to be roused
* Urinary retention or complete inability to urinate
'''Immediate steps:'''
* 1. Call emergency services (911 in US, 112 in EU, 000 in Australia).
* 2. Do not leave the person alone. Prevent self-injury — restrain gently if necessary.
* 3. Move to a cool environment. Apply cool, wet cloths to skin if hyperthermia is suspected.
* 4. Do not induce [[effect:vomiting]]. Do not administer ipecac.
* 5. If the person is unconscious, place in the [[glossary:recovery-position]] to protect the [[glossary:airway]].
'''What to tell the dispatcher:''' "Possible henbane / anticholinergic plant poisoning. [[substance_class:chemical/tropane]] alkaloid exposure — [[substance:scopolamine]] and hyoscyamine." State the preparation consumed (seeds, leaves, tea), estimated amount, time of [[glossary:ingestion]], and current symptoms.
'''Reversal agent:''' Physostigmine is the specific antidote for severe anticholinergic toxidrome, administered only by medical professionals in a monitored setting. It is not available over the counter.
[[glossary:good-samaritan-law|Good Samaritan laws]] exist in many US states and other jurisdictions, providing legal protection for individuals who call emergency services to report a drug-related medical emergency.
{{/Emergency}}
===Aftercare & Integration===
{{Aftercare}}
Anticholinergic delirium typically resolves within 24 hours, with approximately 85% of alkaloids excreted in that period. Post-experience effects may include persistent [[effect:dry-mouth]], [[effect:visual-acuity-suppression]], urinary difficulty, cognitive fog, and [[glossary:fatigue]] lasting 24–48 hours.
Rehydrate aggressively — anticholinergic effects suppress normal fluid regulation. Eat bland, easily digested food when appetite returns. Rest in a low-[[effect:stimulation]] environment.
Anterograde [[effect:amnesia]] is expected: the user may have no memory of events during intoxication. A sitter's account of what occurred can help the user process the experience. If persistent confusion, visual [[glossary:disturbance|disturbances]], or psychological [[glossary:distress]] continue beyond 48 hours, seek medical evaluation.
{{/Aftercare}}
===Recovery & Support===
{{Recovery}}
Compulsive repeat use of ''H. niger'' is rare due to the aversive nature of anticholinergic delirium. No formal [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] data exist, and no substance-specific cessation protocols have been developed.
If persistent psychological distress, [[effect:flashbacks]], or [[effect:anxiety]] follow a henbane experience, standard trauma-informed counselling and psychiatric evaluation are appropriate.
'''Crisis and support resources:'''
* '''SAMHSA National Helpline''' (US): 1-800-662-4357 (free, confidential, 24/7)
* '''Poison Control''' (US): 1-800-222-1222
* '''Crisis Text Line''' (US): Text HOME to 741741
* '''Samaritans''' (UK): 116 123
{{/Recovery}}
''H. niger'' is not controlled under any of the three major UN [[glossary:drug-control]] treaties (1961, 1971, 1988). Its primary alkaloids — [[substance:scopolamine]] and hyoscyamine — are established pharmaceutical compounds on the WHO List of Essential Medicines, not internationally scheduled substances. Where domestic regulation exists, it typically targets the plant as a poison or agricultural pest rather than as a controlled drug{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=faf04906}}.
===Analog and treaty considerations===
''H. niger'' occupies an unusual regulatory position: its alkaloids are [[glossary:fda]]-approved pharmaceutical agents with WHO Essential Medicines status, yet neither the alkaloids nor the plant are controlled under international treaties. Legal exposure in most jurisdictions is limited to poison-labeling requirements, intent-based consumption [[glossary:prohibition|prohibitions]], and agricultural noxious weed designations — reflecting the plant's low [[glossary:prevalence]] as a substance of intentional use relative to other anticholinergic Solanaceae.
| Jurisdiction | Status | Notes |
|---|---|---|
| United States (federal) | Not scheduled (CSA) | Not a controlled substance. Listed as a "poison" under 21 USC Chapter 7; products must carry poison labeling with sales records maintained{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=bf76b452}} |
| Louisiana | Prohibited for human consumption | Act No. 159 (effective 8 August 2005) prohibits ''H. niger'' when intended for human consumption; permits possession for aesthetic, landscaping, or decorative purposes{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=494ac966}} |
| Tennessee | Not scheduled | A proposed ban was not enacted{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=8e434bbf}} |
| US states (agricultural) | Noxious weed | Designated noxious weed in Washington, California, Colorado, Idaho, New Mexico, Nevada, South Dakota, and Wyoming — agricultural regulation, not controlled substance classification{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=701fb643}} |
| Canada (federal) | Not scheduled | Not a controlled substance. Alberta designates it as a noxious weed under provincial invasive species regulation{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=9de2255f}} |
| United Kingdom | Not specifically scheduled{{flag|citation-needed}} | Plant not scheduled under the Misuse of Drugs Act 1971. Pharmaceutical scopolamine and hyoscyamine preparations are prescription-only medicines (POM) |
| Germany | Uncertain{{flag|citation-needed}} | Multiple sources suggest regulation of cultivation and possession beyond other European countries; specific legislation not confirmed |
| Australia | Not believed scheduled{{flag|citation-needed}} | Plant not specifically scheduled under TGA scheduling. Pharmaceutical scopolamine and hyoscyamine products are scheduled prescription medicines. Recreational use documented in 1976{{cite|pubmed=979798|anchor=dbcf9985}} |
===Receptor pharmacology===
Hyoscyamine and [[substance:scopolamine]] are '''competitive, non-selective muscarinic acetylcholine receptor (mAChR) antagonists''', blocking the [[glossary:neurotransmitter]] [[glossary:acetylcholine]] at M1, M2, and M3 [[glossary:receptor-subtypes]] in both the central and peripheral nervous system{{cite|doi=10.1007/s13659-022-00357-w|anchor=b6b4c27d}}.
'''Peripheral muscarinic blockade''' produces: [[effect:pupil-dilation|mydriasis]] (pupil dilation), reduced [[effect:salivation]], bronchodilation, reduced gastrointestinal motility, [[glossary:tachycardia]] (via M2 [[glossary:blockade]]), urinary retention, and [[glossary:inhibition]] of sweating.
'''Central muscarinic blockade''' produces: [[effect:sedation]], [[effect:amnesia]], [[effect:confusion]], and at higher doses, [[effect:delirium]] with auditory, visual, and [[effect:tactile-hallucination|tactile hallucinations]].
The two primary alkaloids differ in their [[glossary:central-nervous-system|CNS]]-to-peripheral effect ratio. Scopolamine has superior [[glossary:blood-brain-barrier]] penetration and produces sedation, amnesia, and antiemetic effects at therapeutic doses; delirium and [[glossary:hallucination|hallucinations]] emerge at toxic doses. Hyoscyamine (and its [[glossary:racemic-mixture]] form atropine) exerts predominantly peripheral effects at low to moderate doses, with central effects emerging at higher doses{{cite|doi=10.1007/s13659-022-00357-w|anchor=b15c5bab}}{{cite|pubmed=25386392|anchor=3808d16e}}. This pharmacological difference makes scopolamine the primary driver of ''H. niger''s psychoactive effects and the more dangerous alkaloid for CNS [[glossary:toxicity]].
===Pharmacokinetics===
Published pharmacokinetic data exist only for purified scopolamine formulations, not crude ''H. niger'' plant preparations. The effective [[glossary:bioavailability]] of alkaloids consumed via [[glossary:plant-material]] will differ due to the plant matrix, fiber content, and variable alkaloid concentration.
'''Scopolamine (oral):''' Bioavailability 3–27%, highly variable between individuals{{cite|pubmed=2762223|anchor=66223cd1}}{{cite|pubmed=16175141|anchor=f5fce668}}. Tmax approximately 0.5 hours{{cite|pubmed=16175141|anchor=f77c700b}}. [[glossary:plasma]] [[glossary:half-life]] 4.5 ± 1.7 hours{{cite|pubmed=2762223|anchor=1285341b}}. Extensive [[glossary:first-pass-metabolism]] is indicated by low urinary [[glossary:excretion]] of unchanged drug (approximately 2.6%).
'''Scopolamine (intravenous):''' [[glossary:clearance]] 205 ± 36.6 L/h; [[glossary:volume-of-distribution]] 363 ± 66.7 L; distribution half-life 2.9 ± 0.67 minutes; terminal half-life 105.4 ± 9.94 minutes{{cite|pubmed=11144994|anchor=ee8190f5}}.
'''Scopolamine (intramuscular):''' Absolute bioavailability 57 ± 8%; peak serum concentration after 0.5 mg approximately 0.96 ng/mL{{cite|pubmed=11144994|anchor=877213e0}}.
'''Scopolamine (transdermal):''' The TTS-patch contains a 1.5 mg reservoir with a 140 µg priming dose, releasing 0.5 mg over 72 hours at approximately 5 µg/h. [[glossary:steady-state|Steady-state]] Cmax of approximately 100 pg/mL (range 11–240 pg/mL) is reached approximately 8 hours post-application{{cite|pubmed=16175141|anchor=55aeaa99}}.
===Metabolism and CYP involvement===
Scopolamine undergoes [[glossary:glucuronidation|glucuronide conjugation]] (major pathway) and oxidative demethylation via '''CYP3A4'''{{cite|pubmed=16175141|anchor=aaad1251}}. Co-administration with [[glossary:grapefruit-juice]] (a [[glossary:cyp3a4]] [[glossary:inhibitor]]) increased scopolamine AUC₀₋₂₄ to approximately 142% of control values and prolonged Tmax from approximately 30 minutes to approximately 60 minutes (p < 0.001){{cite|pubmed=16175141|anchor=ee57be93}}. Scopolamine crosses both the blood-brain barrier and the placenta{{cite|pubmed=16175141|anchor=a1aae7ef}}.
===Open questions===
No neuroimaging studies using ''H. niger'' as administered have been published. The preparation-specific [[glossary:pharmacokinetics]] of alkaloids consumed from plant material — including oral tea, seed [[glossary:ingestion]], and smoked preparations — remain entirely uncharacterized. The scopolamine-to-hyoscyamine ratio varies with plant age, geographic origin, and growing conditions, but no comprehensive study across multiple wild ''H. niger'' populations has quantified this variability for the purpose of predicting psychoactive [[glossary:potency]] or toxicity risk.
''H. niger'' is not controlled under any of the three major UN [[glossary:drug-control]] treaties (1961, 1971, 1988). Its primary alkaloids — [[substance:scopolamine]] and hyoscyamine — are established pharmaceutical compounds on the WHO List of Essential Medicines, not internationally scheduled substances. Where domestic regulation exists, it typically targets the plant as a poison or agricultural pest rather than as a controlled drug{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=40b78125}}.
In the United States, henbane is not a controlled substance under federal law but must carry poison labeling with sales records maintained{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=2d80134b}}. Louisiana prohibits it when [[glossary:human-consumption|intended for human consumption]]{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=a64a2d6e}}. Multiple states designate it a noxious weed for agricultural purposes — including Washington, California, Colorado, Idaho, New Mexico, Nevada, South Dakota, and Wyoming{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=e2bbb7d5}}. Canada does not schedule it federally, though Alberta lists it as a noxious weed{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=7d53cd2c}}. In the United Kingdom, the plant is [[glossary:unscheduled|not scheduled]] under the Misuse of Drugs Act 1971, though pharmaceutical scopolamine and hyoscyamine products are prescription-only medicines{{flag|citation-needed}}. Germany is reported to impose additional restrictions on cultivation and [[glossary:possession]], though specific legislation is unconfirmed{{flag|citation-needed}}. Australia does not appear to schedule the plant specifically, though pharmaceutical forms are regulated{{flag|citation-needed}}.
===Analog and treaty considerations===
''H. niger'' occupies an unusual regulatory position: its alkaloids are [[glossary:fda]]-approved pharmaceutical agents with WHO Essential Medicines status, yet neither the alkaloids nor the plant are [[glossary:international-control|internationally controlled]]. Legal exposure in most jurisdictions is limited to poison-labeling requirements, intent-based consumption [[glossary:prohibition|prohibitions]], and agricultural noxious weed designations.
{{Warning}}
Legal status changes frequently. This overview reflects the status as of the article's last update and is not legal advice. Verify current law in the relevant jurisdiction before acting on this information.
{{/Warning}}
The defining experiential character of ''H. niger'' is anticholinergic [[effect:delirium]] — a state qualitatively unlike the visionary or introspective experiences produced by [[glossary:serotonergic-psychedelics]] or [[substance_class:psychoactive/dissociative|dissociatives]]. The experience is characterized by complete loss of [[glossary:insight]] into the intoxicated state, interaction with phantom persons and objects, and an inability to distinguish [[glossary:hallucination]] from reality. [[glossary:set-and-setting]] exert minimal moderating influence because the delirious state overrides environmental [[glossary:awareness]]. Preparation type modulates onset and duration but not the fundamental character of the experience; the extreme variability in alkaloid content across geographic strains and plant parts is the dominant unpredictable modifier.
Among anticholinergic [[substance_class:psychoactive/deliriant|deliriants]], ''H. niger'' is most closely comparable to ''Datura stramonium'' and ''Atropa belladonna'', sharing [[substance_class:chemical/tropane]] alkaloid pharmacology and clinical presentation. Its relatively high [[substance:scopolamine]]-to-hyoscyamine ratio produces a more sedative and amnestic profile compared with atropine-dominant species, though all three plants produce the same core anticholinergic syndrome at toxic doses.
===Toxicity===
''H. niger'' is a highly toxic plant; all parts — leaves, seeds, and roots — contain pharmacologically active [[substance_class:chemical/tropane]] alkaloids{{cite|pubmed=25386392|anchor=dcf10dc4}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=0dc7a817}}.
====Acute toxicity====
No published [[glossary:lethal-dose|LD₅₀]] data for whole ''H. niger'' plant material in humans exist. For purified [[substance:scopolamine]] and hyoscyamine (atropine), therapeutic and toxic doses are in the milligram range; the margin between effect and severe [[glossary:toxicity]] is narrow. The European Food Safety Authority (EFSA) established a group Acute Reference Dose (ARfD) of '''0.016 µg/kg body weight''' (sum of hyoscyamine and scopolamine, assuming equal [[glossary:potency]]) based on decreased [[glossary:heart-rate]] in a human volunteer study{{cite|doi=10.2903/j.efsa.2013.3386|anchor=282d231f}}{{flag|additional-citations-needed}}.
The clinical presentation of acute ''H. niger'' poisoning is the full anticholinergic syndrome. In published clinical series: [[effect:pupil-dilation]] occurs in 94.8% of cases, [[effect:restlessness]] in 89.5%, and [[glossary:hallucination|hallucinations]] (auditory, visual, or tactile) in 89.5%{{cite|pubmed=25386392|anchor=c7e920e7}}. Additional features include [[glossary:tachycardia]], [[effect:dry-mouth]], warm flushed dry skin, [[glossary:hyperthermia]], urinary retention, [[effect:constipation]], [[effect:confusion]], disorientation, [[effect:delirium]], and combative behavior. At severe doses: [[glossary:arrhythmia]], [[glossary:seizure|convulsions]], and coma{{cite|pubmed=25386392|anchor=ecfb5cc9}}.
====Population-level data====
The Swiss [[glossary:toxicology]] Information Center documented 3 severe ''H. niger'' poisoning cases with anticholinergic syndrome among 152 total severe plant poisoning cases over a 29-year period (1966–1994) — compared with 42 cases for ''Atropa belladonna'' and 17 for ''Datura stramonium''{{cite|pubmed=8711457|anchor=ca0d2277}}. A European review of anticholinergic Solanaceae [[glossary:intoxication|intoxications]] (1966–2018) found that ''H. niger'' poisonings primarily result from the plant being mistaken for edible species; intentional use for psychoactive effect was substantially less common than for ''Datura''{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=93d3d8cb}}. In Australia, a 1976 [[glossary:case-report]] of deliberate henbane flower chewing noted "more widespread use of this plant among the drug-taking community," suggesting unreported cases{{cite|pubmed=979798|anchor=2ca63526}}.
====Contaminant and food safety risk====
The primary contamination vector for ''H. niger'' is '''food supply contamination''': seeds can enter cereal grains (buckwheat, millet), herbal teas, edible flowers, beans, and linseed during harvest and processing{{cite|doi=10.3920/QAS2013.0314|anchor=5ac03e3d}}. EFSA found that toddler dietary exposure to tropane alkaloids could exceed the group ARfD on 11–18% of consumption days based on limited data from two EU member states{{cite|doi=10.2903/j.efsa.2013.3386|anchor=ad2df255}}. At the time of the 2013 EFSA opinion, no regulatory maximum limits for tropane alkaloids in food had been established in the EU{{cite|doi=10.2903/j.efsa.2013.3386|anchor=aa794dec}}.
For deliberately obtained plant material, no published data on product contamination or adulteration exist. The plant's distinctive morphology makes physical product adulteration unusual. '''Intra-batch variability in alkaloid content''' — driven by geographic origin, growing conditions, and plant part — is the primary safety-relevant variable for intentional use. No ISO/IEC-accredited laboratory testing program or Certificate of Analysis requirement exists for ''H. niger'' plant material sold in commerce.
====Vulnerable populations====
* '''Children:''' Substantially more sensitive to anticholinergic effects; as few as 4 flowers may cause clinical poisoning in pre-school children{{cite|pubmed=25386392|anchor=e2162ecc}}{{flag|safety-citation-needed}}
* '''Elderly:''' Heightened anticholinergic [[glossary:sensitivity]] with significantly elevated risk of delirium; long-term anticholinergic exposure is associated with increased dementia risk{{cite|doi=10.1111/jnc.15244|anchor=374794a8}}
* '''Pregnant individuals:''' Scopolamine crosses the placenta; use without clinical supervision is contraindicated{{cite|pubmed=16175141|anchor=1454ebb8}}
* '''Hepatic impairment:''' May reduce alkaloid [[glossary:metabolism]] via [[glossary:cyp3a4]]; no ''H. niger''-specific data are available
===Psychological risks===
The primary psychoactive effect of ''H. niger'' at doses achievable from plant material is '''delirium''' — an agitated, non-lucid state characterized by hallucinations and confusion that is not voluntarily controllable{{cite|pubmed=25386392|anchor=3c542c79}}{{flag|additional-citations-needed}}. This is pharmacologically and experientially distinct from the controlled hallucinatory states associated with [[glossary:serotonergic-psychedelics]].
'''Reality testing is severely impaired''' during anticholinergic delirium. Individuals may act on [[effect:delusions]] with risk of self-harm, falls, or injury due to [[effect:spatial-disorientation]]. Reported hallucinations commonly include conversations with absent persons, interaction with non-existent objects, and phantom activities such as cigarette smoking{{cite|doi=10.1016/j.toxicon.2020.02.005|anchor=40ddac2d}}{{flag|additional-citations-needed}}.
All published psychoactive effects of ''H. niger'' occur at doses overlapping with the toxic [[glossary:dose-range]]; no sub-toxic psychoactive threshold has been established{{cite|pubmed=25386392|anchor=c37b99b5}}{{flag|additional-citations-needed}}. Anticholinergic delirium may precipitate or exacerbate [[glossary:psychotic-episodes]] in psychiatrically predisposed individuals{{flag|citation-needed}}.
===Tolerance & dependence===
Published data on [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] specific to ''H. niger'' or its constituent alkaloids in a recreational or non-pharmaceutical context are '''absent from the literature'''.
No tolerance studies for chronic scopolamine or hyoscyamine consumption in humans outside pharmaceutical contexts have been published. No abuse liability studies for ''H. niger'' exist. No withdrawal syndrome has been documented. In pharmaceutical use, scopolamine is classified as a non-addictive agent and is not scheduled as a controlled substance in most jurisdictions based on [[glossary:abuse-potential]].
The unpleasant and often terrifying nature of anticholinergic delirium strongly limits voluntary repeat use{{cite|doi=10.1371/journal.pone.0247688|anchor=7040828d}}{{flag|additional-citations-needed}}. This aversive quality functions as a natural deterrent to compulsive [[glossary:redose|redosing]].
===Drug Interactions===
The most significant pharmacokinetic interaction documented for ''H. niger'' alkaloids involves '''CYP3A4 inhibition'''. Co-administration of oral scopolamine with 150 mL grapefruit juice increased scopolamine AUC₀₋₂₄ to approximately 142% of control values; absolute oral [[glossary:bioavailability]] increased from the 3–27% range to 6–37%, and Tmax was prolonged from approximately 30 to approximately 60 minutes{{cite|pubmed=16175141|anchor=cd6c4f0f}}{{flag|additional-citations-needed}}. Any CYP3A4 [[glossary:inhibitor]] — including ketoconazole, erythromycin, and HIV protease inhibitors — would be expected to produce a similar effect.
'''Additive anticholinergic burden''' represents the most clinically dangerous pharmacodynamic interaction class. The following [[glossary:medication]] categories carry established anticholinergic properties that are additive with ''H. niger'' alkaloids{{cite|doi=10.3389/fphar.2012.00069|anchor=9fd9952b}}{{flag|additional-citations-needed}}:
* '''Tricyclic antidepressants''' (amitriptyline, imipramine): strong anticholinergic properties; additive risk for delirium, urinary retention, and hyperthermia
* '''First-generation antihistamines''' ([[substance:diphenhydramine]], hydroxyzine): additive anticholinergic effects
* '''Antipsychotics''' ([[substance_class:chemical/phenothiazine|phenothiazines]], clozapine): additional anticholinergic burden
* '''Benzodiazepines and alcohol:''' additive [[glossary:central-nervous-system|CNS]] [[effect:depression]] with scopolamine's sedative effects
No clinical case reports of specific ''H. niger'' combined with a named pharmaceutical drug have been identified in published literature; the interaction predictions above derive from the well-established pharmacology of the constituent alkaloids.
'''Physostigmine''' (a cholinesterase inhibitor) pharmacodynamically antagonizes anticholinergic effects and is used therapeutically to reverse severe anticholinergic delirium. A randomized trial found physostigmine superior to [[substance:lorazepam]] for treatment of antimuscarinic toxidrome{{cite|doi=10.1080/15563650.2020.1854281|anchor=07671df2}}, and a prospective study from a regional poison center confirmed its superiority over non-antidote therapy{{cite|doi=10.1080/15563650.2018.1485154|anchor=c0dc99aa}}. A retrospective analysis of 815 anticholinergic toxidrome patients found physostigmine associated with a lower intubation rate (1.9% vs 8.4%){{cite|doi=10.1007/s13181-014-0452-x|anchor=56561079}}.
===Contraindications===
'''Absolute contraindications:'''
* '''Concurrent anticholinergic medication use:''' Tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], first-generation antihistamines, [[substance_class:psychoactive/antipsychotic|antipsychotics]] with anticholinergic properties, and antiparkinsonian anticholinergics create additive anticholinergic burden that substantially lowers the toxicity threshold
* '''Pregnancy:''' Scopolamine crosses the placenta; teratogenicity data are limited but clinical supervision is required for any exposure{{cite|pubmed=16175141|anchor=0703556a}}
* '''Pediatric exposure:''' Children demonstrate substantially heightened sensitivity to anticholinergic effects{{cite|pubmed=25386392|anchor=e421067b}}
'''Relative contraindications:'''
* '''Cardiac conditions:''' Anticholinergic-induced tachycardia and potential arrhythmia pose elevated risk in individuals with pre-existing cardiac disease
* '''Urinary retention or prostatic hypertrophy:''' Muscarinic [[glossary:blockade]] exacerbates urinary retention
* '''Angle-closure glaucoma:''' Mydriasis induced by muscarinic [[glossary:antagonism]] may precipitate acute angle-closure crisis
* '''Hepatic impairment:''' Reduced CYP3A4 metabolic capacity may slow scopolamine [[glossary:clearance]], prolonging and intensifying effects
* '''Psychiatric history (psychotic spectrum disorders):''' Anticholinergic delirium may precipitate or worsen psychotic episodes{{flag|citation-needed}}
* '''Elderly:''' Age-related increase in anticholinergic sensitivity; long-term exposure associated with dementia risk{{cite|doi=10.1111/jnc.15244|anchor=bf174100}}{{flag|additional-citations-needed}}
===Detection===
Standard immunoassay drug panels do not detect scopolamine or hyoscyamine — these alkaloids are not included in routine urine drug screens and show no cross-reactivity with standard opiate, [[substance:amphetamine]], [[substance_class:chemical/benzodiazepine]], or [[substance_class:psychoactive/cannabinoid]] [[glossary:assay|assays]]{{cite|pubmed=18787311|anchor=9c0a04bb}}{{flag|additional-citations-needed}}.
LC-MS/MS can detect both alkaloids in serum (limit of detection 0.02 ng/mL) and urine (170–670 ng/mL in clinical poisoning cases){{cite|pubmed=18787311|anchor=348fa4f6}}. In a drug-facilitated sexual assault case, scopolamine was detected in urine at 41 µg/L at 18 hours post-exposure, and in hair at 0.37 pg/mg at 5 weeks post-exposure; blood was negative at 18 hours{{cite|doi=10.1016/j.forsciint.2023.111678|anchor=cfb2fdbe}}. Detection requires a specific laboratory request for tropane alkaloid screening.
{{Emergency}}Acute ''H. niger'' poisoning requires emergency medical attention. Management: (1) supportive care as the mainstay; (2) activated charcoal if [[glossary:ingestion]] was recent and [[glossary:airway]] is protected — not ipecac{{cite|pubmed=25386392|anchor=e35fda9d}}; (3) benzodiazepines for [[glossary:agitation]] and seizure prevention; (4) physostigmine for severe anticholinergic delirium{{cite|doi=10.1080/15563650.2020.1854281|anchor=265b77f5}}{{cite|doi=10.1080/15563650.2018.1485154|anchor=93258a3b}}; (5) active temperature management for hyperthermia; (6) cardiac monitoring for arrhythmia. Approximately 85% of alkaloids are excreted within 24 hours{{cite|pubmed=25386392|anchor=22becc72}}.
Poison Control Center (US): 1-800-222-1222{{/Emergency}}
''H. niger'' is not controlled under the 1961 UN Single Convention on Narcotic Drugs, the 1971 [[glossary:convention-on-psychotropic-substances]], or the 1988 Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances. The constituent alkaloids [[substance:scopolamine]] and hyoscyamine are not internationally scheduled in their plant-derived form; they are pharmaceutical agents listed on the WHO List of Essential Medicines. Domestic regulation, where it exists, primarily targets the plant's status as a poison or its agricultural impact as a noxious weed rather than scheduling it alongside controlled substances.
===Analog and treaty considerations===
''H. niger'' occupies an unusual regulatory position: its primary alkaloids are established pharmaceutical compounds with [[glossary:fda]]-approved formulations and WHO Essential Medicines List status, yet neither the alkaloids nor the plant are controlled under [[glossary:drug-control|international drug control]] treaties. The plant's legal exposure in most jurisdictions is limited to poison-labeling requirements (United States federal), intent-based consumption [[glossary:prohibition|prohibitions]] (Louisiana), and agricultural noxious weed designations (multiple US states and Canadian provinces). This regulatory fragmentation reflects the plant's low [[glossary:prevalence]] as a substance of intentional use relative to other anticholinergic Solanaceae.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States (federal) | Not scheduled (CSA) | Not a controlled substance under Title 21. Listed as a "poison" under 21 USC Chapter 7, requiring products to carry appropriate labeling ("poison" or "for external use only") with sales records maintained{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=4382bdbd}} |
| Louisiana | Prohibited for human consumption | Act No. 159 (effective 8 August 2005) prohibits ''H. niger'' when intended for human consumption; permits possession, cultivation, and harvesting for aesthetic, landscaping, or decorative purposes{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=e804abae}} |
| Tennessee | Not scheduled | A proposed ban was not enacted{{cite|name=erowid-henbane-law|type=web|author=Erowid|year=2023|title=Henbane Legal Status|anchor=41eb0a5b}} |
| US states (agricultural) | Noxious weed | Designated noxious weed in Washington, California, Colorado, Idaho, New Mexico, Nevada, South Dakota, and Wyoming — agricultural regulation, not controlled substance classification{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=f76f050f}} |
| Canada (federal) | Not scheduled | Not a controlled substance. Alberta designates it as a noxious weed under provincial invasive species regulation{{cite|name=invasive-org-henbane|type=web|author=Various state/provincial agencies|year=2024|title=Noxious weed status of black henbane in US states and Canadian provinces|anchor=23334edd}} |
| United Kingdom | Not specifically scheduled{{flag|citation-needed}} | Plant not scheduled under the Misuse of Drugs Act 1971. Pharmaceutical scopolamine and hyoscyamine preparations are prescription-only medicines (POM) |
| Germany | Uncertain{{flag|citation-needed}} | Multiple sources suggest regulation of cultivation and possession beyond other European countries; specific legislation not confirmed in available sources |
| Australia | Not believed scheduled{{flag|citation-needed}} | Plant not specifically scheduled under TGA scheduling. Pharmaceutical scopolamine and hyoscyamine products are scheduled prescription medicines. Recreational use documented in 1976{{cite|pubmed=979798|anchor=4bb970a0}} |
Evidence Changes28 added
+Shim KH, Kang MJ, Sharma N, An SSA 2022— Beauty of the beast: anticholinergic tropane alkaloids in therapeutics
+Renner UD, Oertel R, Kirch W 2005— Pharmacokinetics and pharmacodynamics in clinical use of scopolamine
+Alizadeh A, Moshiri M, Alizadeh J, Balali-Mood M 2014— Black henbane and its toxicity - a descriptive review
+Fatur K, Kreft S 2021— Nixing the nightshades: Traditional knowledge of intoxicating members of the Solanaceae among hallucinogenic plant and mushroom users in Slovenia
+Putcha L, Cintrón NM, Tsui J, Vanderploeg JM, Kramer WG 1989— Pharmacokinetics and oral bioavailability of scopolamine in normal subjects
+Wang GS, Baker K, Ng P, et al. 2021— A randomized trial comparing physostigmine vs lorazepam for treatment of antimuscarinic (anticholinergic) toxidrome
+Cavalloro V, Soddu F, Baroni S, et al. 2023— Teodorico Borgognoni's Formulary for Thirteenth Century Anesthetic Preparations
+Teixidor-Toneu I, Martin GJ, Ouhammou A, Puri RK, Hawkins JA 2016— An ethnomedicinal survey of a Tashelhit-speaking community in the High Atlas, Morocco
+Kohnen KL, Sezgin S, Spiteller M, Hagels H, Kayser O 2018— Localization and Organization of Scopolamine Biosynthesis in Duboisia myoporoides R. Br.
+Perry EK, Pickering AT, Wang WW, Houghton PJ, Perry NS 1999— Medicinal Plants and Alzheimer's Disease: from Ethnobotany to Phytotherapy
+Fatur K, Kreft S 2020— Common anticholinergic solanaceaous plants of temperate Europe - A review of intoxications from the literature (1966-2018)
+EFSA Panel on Contaminants in the Food Chain (CONTAM) 2013— Scientific Opinion on Tropane Alkaloids in Food and Feed
+Ahmadpour R, Zanjani BM, Garoosi GA, Farjaminezhad R, Haddad R 2024— Ultrasound-assisted extraction of scopolamine and hyoscyamine from Hyoscyamus niger roots using central compost design
+Guo Z, Tan H, Lv Z, et al. 2018— Targeted expression of Vitreoscilla hemoglobin improves the production of tropane alkaloids in Hyoscyamus niger hairy roots
+Jaremicz Z, Luczkiewicz M, Kokotkiewicz A, Krolicka A, Sowinski P 2014— Production of tropane alkaloids in Hyoscyamus niger (black henbane) hairy roots grown in bubble-column and spray bioreactors
+Li X, Qiang W, Qiu F, et al. 2017— Cloning and characterization of an aromatic amino acid aminotransferase (ArAT) gene involved in tropane alkaloid biosynthesis from Hyoscyamus niger
+Hashimoto T, Yamada Y 1987— Purification and characterization of hyoscyamine 6 beta-hydroxylase from root cultures of Hyoscyamus niger L.
+Adamse P, van Egmond HP, Noordam MY, Mulder P, de Nijs M 2014— Tropane alkaloids in food: poisoning incidents
+Sands JM, Sands R 1976— Henbane chewing
+Marzoughi S, Banerjee A, Jutzeler CR, et al. 2021— Tardive neurotoxicity of anticholinergic drugs: A review
+Fasinu PS, Bouic P, Rosenkranz B 2012— An Overview of the Evidence and Mechanisms of Herb-Drug Interactions
+Boley SP, Olives TD, Bangh SA, Fahrner S, Cole JB 2019— Physostigmine is superior to non-antidote therapy in the management of antimuscarinic delirium: a prospective study from a regional poison center
+Watkins JW, Schwarz ES, Arroyo-Plasencia AM, Mullins ME 2015— The Use of Physostigmine by Toxicologists in Anticholinergic Toxicity.
+Konishi T, Akaki K, Hatano K 2008— Determination of hyoscyamine and scopolamine in serum and urine of humans by liquid chromatography with tandem mass spectrometry
+Melchior SE, Nielsen MKK, Oropeza AR, Banner J, Johansen SS 2023— Detection of scopolamine in urine and hair in a drug-facilitated sexual assault
+Ebert U, Grossmann M, Oertel R, Gramatte T, Kirch W 2001— Pharmacokinetic-pharmacodynamic modeling of the electroencephalogram effects of scopolamine in healthy volunteers
+Jaspersen-Schib R, Theus L, Guirguis-Oeschger M, Gossweiler B, Meier-Abt PJ 1996— Serious plant poisonings in Switzerland 1966-1994. Case analysis from the Swiss Toxicology Information Center
Data Field Changes1 changed · 15 unchanged
| Field | r1 | r2 | |
|---|---|---|---|
| Summary | (empty) | → | Hyoscyamus niger is a toxic solanaceous plant containing the tropane alkaloids scopolamine and hyoscyamine, classified as a deliriant. All psychoactive effects occur at doses overlapping with the anticholinergic toxic range; no safe dose has been established for any preparation. |
Effects Profile Changes90 added
Added (90)
Auditory distortionperception
0.500.50
Auditory hallucinationsperception
0.600.60
Auditory misinterpretationperception
0.400.50
Brightness alterationperception
0.500.70
Depth perception distortionperception
0.500.60
Double visionperception
0.500.50
Dreaming enhancementperception
0.400.40
External hallucinationsperception
0.800.80
Internal hallucinationsperception
0.500.40
Light sensitivityperception
0.700.90
Object activationperception
0.500.50
Object transformationsperception
0.400.40
Peripheral misidentificationperception
0.600.60
Peripheral vision distortionperception
0.500.50
Proprioceptive distortionperception
0.400.40
Shadow peopleperception
0.600.60
Sleep-transition hallucinationsperception
0.400.40
Spatial disorientationperception
0.700.80
Vestibular distortionperception
0.500.60
Visual acuity suppressionperception
0.800.90
Visual haze / noiseperception
0.500.60
Visual processing suppressionperception
0.500.60
Abnormal heartbeatbody
0.700.90
Bodily dissociationbody
0.400.40
Body schema distortionbody
0.400.40
Breathing alterationbody
0.500.60
Constipationbody
0.600.80
Dehydration sensationbody
0.500.70
Dizzinessbody
0.600.70
Dry mouthbody
0.801.00
Heart rate perception changesbody
0.600.70
Insomniabody
0.400.50
Involuntary body movementsbody
0.400.40
Motor control impairmentbody
0.700.80
Muscle relaxationbody
0.400.50
Nauseabody
0.400.50
Nausea suppressionbody
0.600.50
Nystagmus (eye wobbles)body
0.400.40
Pain suppressionbody
0.400.40
Physical fatiguebody
0.500.60
Pupil dilationbody
0.901.00
Restlessnessbody
0.600.70
Sedationbody
0.700.60
Stimulationbody
0.500.50
Tactile hallucinationbody
0.600.60
Memory fragmentationthinking
0.700.80
Temperature dysregulationbody
0.700.80
Tremblingbody
0.400.40
Vomitingbody
0.400.40
Wakefulnessbody
0.500.50
Amnesiathinking
0.700.80
Analysis suppressionthinking
0.700.80
Cognitive dysphoriathinking
0.700.70
Cognitive fatiguethinking
0.500.60
Cognitive impairmentthinking
0.900.90
Confusionthinking
0.900.90
Decision impairmentthinking
0.800.90
Deliriumthinking
0.900.80
Delusionsthinking
0.700.70
Delusions of sobrietythinking
0.600.70
Focus suppressionthinking
0.800.90
Information processing suppressionthinking
0.800.80
Language suppressionthinking
0.500.60
Memory suppressionthinking
0.800.80
Motivation suppressionthinking
0.500.50
Suggestibility enhancementthinking
0.600.60
Thought decelerationthinking
0.500.50
Thought disorganizationthinking
0.800.80
Anxietyfeeling
0.700.70
Anxiety suppressionfeeling
0.300.30
Dysphoriafeeling
0.700.70
Emotional labilityfeeling
0.600.70
Euphoriafeeling
0.300.30
Irritabilityfeeling
0.600.70
Paranoiafeeling
0.600.70
Boundary dissolutionself
0.400.40
Cognitive disconnectionself
0.800.80
Communication suppressionself
0.700.70
Compulsive repetitive behaviorself
0.500.50
Depersonalizationself
0.400.40
Derealizationself
0.500.50
Disinhibitionself
0.500.60
Emotional susceptibilityself
0.500.50
Identity alterationself
0.400.40
Self-control suppressionself
0.700.70
Social disconnectionself
0.700.70
Temporal disorientationtime
0.800.80
Time alterationtime
0.500.50
Entity contacttranspersonal
0.500.50
Reality testing impairmentawareness
0.900.90