Atropa belladonna

'''Deadly nightshade''' (''Atropa belladonna'' L., Solanaceae) is a perennial plant whose leaves, roots, and berries all contain potent anticholinergic poisons. Its two principal alkaloids — atropine and [[substance:scopolamine]] — block [[glossary:acetylcholine]] signaling throughout the brain and body{{cite|doi=10.1021/acschemneuro.8b00615|anchor=b0ac3354}}. This [[glossary:blockade]] disrupts the autonomic nervous system, producing [[effect:delirium]] rather than [[glossary:insight]]. Belladonna's toxic and hallucinogenic properties have been recognized since classical antiquity; Linnaeus formally named the plant in 1753{{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=68671b55}}. Isolation of atropine in the 1830s proved pivotal to neuroscience, helping identify acetylcholine as a mammalian [[glossary:neurotransmitter]]{{cite|pubmed=17575737|anchor=e480dffc}}. Both atropine and scopolamine remain on the WHO List of Essential Medicines{{cite|doi=10.1007/s13659-022-00357-w|anchor=ed888835}}, while the plant itself is largely [[glossary:unscheduled]] internationally. [[index:effects|Subjective effects]] include true [[glossary:hallucination|hallucinations]] indistinguishable from reality, profound [[effect:amnesia]], confused thinking, and complete loss of insight into the intoxicated state. The experience is not meaningfully controllable — users interact with absent people and shadow figures without recognizing they are intoxicated. [[glossary:tachycardia]], extreme [[effect:dry-mouth]], inability to sweat, and pupils that remain dilated for 24–72 hours accompany every exposure. No [[glossary:dependence]] syndrome has been documented; the consistently terrifying and dysphoric character of the experience limits repeated use. The [[glossary:acute-toxicity]] risk is critical — the safety threshold sits at just 0.016 µg/kg body weight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=4764e2d7}}, and the margin between pharmacological effect and life-threatening poisoning is exceptionally narrow. Extreme batch-to-batch alkaloid variability makes any dose estimate effectively unreliable, and no controlled human [[glossary:dose-finding-study|dose-finding studies]] exist for whole-plant preparations.

'''Deadly nightshade''' (''Atropa belladonna'' L., Solanaceae) is a perennial herbaceous plant producing [[substance_class:chemical/tropane]] alkaloids with potent anticholinergic and [[substance_class:psychoactive/deliriant]] properties. Its principal active constituents — atropine ([[glossary:racemic-mixture]] hyoscyamine) and [[substance:scopolamine]] — are non-selective [[substance_class:pharmacological/muscarinic-acetylcholine-receptor-antagonist|muscarinic acetylcholine receptor antagonists]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=5595b916}}. These alkaloids produce their effects by blocking [[glossary:muscarinic-acetylcholine-receptor|muscarinic receptors]] throughout the peripheral and [[glossary:central-nervous-system|central nervous systems]], disrupting autonomic regulation, cognition, and sensory processing. Formally described by Linnaeus in 1753{{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=d0f468e3}}, belladonna has been recognized as both poison and medicine since classical antiquity. Isolation of atropine in the 1830s proved foundational to neuroscience, enabling identification of [[glossary:acetylcholine]] as a mammalian [[glossary:neurotransmitter]]{{cite|pubmed=17575737|anchor=6020f963}}. Both atropine and scopolamine remain on the WHO List of Essential Medicines{{cite|doi=10.1007/s13659-022-00357-w|anchor=74687356}}, while the plant itself is largely [[glossary:unscheduled]] internationally. [[index:effects|Subjective effects]] include true [[glossary:hallucination|hallucinations]] indistinguishable from reality, profound [[effect:amnesia]], [[effect:thought-disorganization]], and involuntary [[effect:delirium]]. The experience is consistently described as terrifying and dysphoric — a state of complete loss of [[glossary:insight]] where users cannot distinguish drug-induced [[glossary:perception|perceptions]] from actual events. Concurrent peripheral effects include [[glossary:tachycardia]], extreme [[effect:dry-mouth]], [[effect:pupil-dilation]] persisting 24–72 hours, and dangerous [[glossary:hyperthermia]] from inability to sweat. No [[glossary:dependence]] syndrome or compulsive use pattern has been described for belladonna alkaloids; the consistently aversive character of the experience limits [[glossary:redose|redosing]] behavior. [[glossary:acute-toxicity]] risk is '''critical''' — the margin between pharmacological effect and life-threatening poisoning is exceptionally narrow, with the EFSA acute reference dose set at 0.016 µg/kg body weight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=321f79b6}}. No controlled human [[glossary:dose-finding-study|dose-finding studies]] exist for whole-plant preparations, and extreme batch-to-batch variability in alkaloid content makes reliable dosing effectively impossible.

'''Atropa belladonna''' ('''deadly nightshade''') is a perennial herbaceous plant of the family Solanaceae, native to Europe, northern Iran, and northwestern Africa. It produces [[substance_class:chemical/tropane]] alkaloids — principally (-)-hyoscyamine (which racemizes to atropine upon extraction) and [[substance:scopolamine]] (hyoscine) — that act as non-selective [[substance_class:pharmacological/muscarinic-acetylcholine-receptor-antagonist|muscarinic acetylcholine receptor antagonists]], making it one of the most pharmacologically potent [[substance_class:psychoactive/deliriant]] plants{{cite|doi=10.1021/acschemneuro.8b00615|anchor=62475dfa}}. Preparations include raw berries, dried leaf, tinctures, and topical ointments; central effects typically persist 4–12 hours after [[glossary:ingestion|oral ingestion]], with [[effect:pupil-dilation]] lasting 24–72 hours or longer. First formally described by Linnaeus in 1753{{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=4e677a7b}}, ''A. belladonna'' has been recognized as both a lethal poison and a medicinal agent since classical antiquity. Isolation of L-atropine from the plant in the 1830s proved foundational to neuroscience: atropine's muscarinic [[glossary:blockade]] enabled the identification of [[glossary:acetylcholine]] as a mammalian [[glossary:neurotransmitter]]{{cite|pubmed=17575737|anchor=5aaa0924}}. Both atropine and scopolamine remain on the WHO List of Essential Medicines, with approved clinical applications including cardiac vagolysis, bronchodilation, and nerve agent antidote use{{cite|doi=10.1007/s13659-022-00357-w|anchor=5c5d7252}}. The plant itself is largely [[glossary:unscheduled]] internationally, occupying a regulatory gap despite significant toxic and psychoactive potential. L-hyoscyamine and scopolamine competitively antagonize [[glossary:muscarinic-acetylcholine-receptor|muscarinic acetylcholine receptors]] (M1, M2, M3) throughout the peripheral and [[glossary:central-nervous-system|central nervous systems]]. Scopolamine crosses the [[glossary:blood-brain-barrier]] more readily than atropine due to its epoxide ring, producing proportionally greater central effects including [[effect:sedation]] and [[glossary:hallucination|hallucinations]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=60039da1}}. Belladonna [[glossary:intoxication]] produces anticholinergic [[effect:delirium]] — true hallucinations indistinguishable from reality, profound [[effect:amnesia]], [[effect:thought-disorganization]], and concurrent peripheral signs including [[glossary:tachycardia]], mydriasis, and anhidrosis. The experience is consistently described as involuntary, terrifying, and dysphoric in published case literature. Effects vary substantially by preparation method, plant part, and batch alkaloid content. ''A. belladonna'' presents a '''critical''' [[glossary:acute-toxicity]] risk. No controlled human [[glossary:dose-finding-study|dose-finding studies]] exist for whole-plant preparations; the margin between pharmacological effect and life-threatening [[glossary:toxicity]] is exceptionally narrow, with the EFSA acute reference dose set at 0.016 µg/kg body weight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=3ef5f976}}. Children are the highest-risk group due to berries' palatability and resemblance to edible fruits. No [[glossary:tolerance]], [[glossary:dependence]], or [[glossary:withdrawal]] specific to belladonna alkaloids has been characterized in published literature. Commercial preparations show extreme batch-to-batch variability, and [[glossary:contamination]] of herbal products with tropane alkaloids has caused life-threatening poisoning despite quality control measures.

===Traditional and historical use=== Belladonna's toxic properties were known in ancient Greece and Rome, and Egyptian medical sources document use of related anticholinergic compounds some 3,500 years ago{{cite|doi=10.1089/jamp.2016.1297|anchor=0004a01b}}. In medieval Europe, the plant served simultaneously as medicine, poison, and component of ritual preparations — fat-based ointments applied to the skin delivered [[substance:scopolamine]] and hyoscyamine transdermally, producing vivid [[glossary:hallucination|hallucinations]] that users interpreted as supernatural flight{{cite|doi=10.1089/jamp.2016.1297|anchor=1e1d3cc2}}{{cite|pubmed=16175141|anchor=8e6b1e66}}. Compound preparations also served as surgical anaesthetics, and pharmacological analysis of medieval "soporific sponge" formulas confirms they were genuinely active{{cite|doi=10.1016/j.jep.2014.05.048|anchor=4e640da5}}. The genus name references Atropos, the Greek Fate who severs the thread of life. The species name ''belladonna'' ("beautiful woman") recalls the Renaissance practice of instilling the plant's juice into the eyes to dilate the pupils, then considered a mark of beauty{{cite|pubmed=17575737|anchor=6c5c9ccd}}. Linnaeus formally described the plant in ''Species Plantarum'' in 1753{{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=97b2e976}}. ===Western discovery and pharmaceutical significance=== Isolation of pure L-atropine in the 1830s was a landmark for autonomic neuroscience{{cite|pubmed=17575737|anchor=d487eab8}}. Atropine's capacity to block the effects of vagus nerve [[effect:stimulation]] led directly to identification of [[glossary:acetylcholine]] as a mammalian [[glossary:neurotransmitter]]{{cite|pubmed=17575737|anchor=ba700d2a}}. Inhaled belladonna preparations — burning dried leaf and medicinal cigarettes — were widely prescribed for asthma throughout the 19th and early 20th centuries, establishing the anticholinergic bronchodilator drug class from which modern agents like ipratropium descend{{cite|doi=10.1089/jamp.2016.1297|anchor=db4491e0}}. ===Modern era=== Lacković (2017) documented a previously unreported tradition of intentional hallucinogenic use of belladonna berries in continental Croatia, known locally as "bunanje"{{cite|doi=10.24869/psyd.2017.379|anchor=0b9e8ee1}}. A survey of recreational [[substance_class:psychoactive/hallucinogen]] users in Slovenia found knowledge of anticholinergic Solanaceae use largely lost, attributed to the dysphoric and high-risk character of the experience{{cite|doi=10.1371/journal.pone.0247688|anchor=ffba831e}}. In 2016–2017, the [[glossary:fda]] issued safety alerts and requested a nationwide voluntary recall of Hyland's homeopathic teething tablets after [[glossary:laboratory-analysis]] found inconsistent and excessive belladonna alkaloid concentrations, with over 400 [[glossary:adverse-events]] in infants reported between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=0fc1ae5c}}.

===Traditional and historical use=== Carl Linnaeus formally described ''Atropa belladonna'' in ''Species Plantarum'' (1753){{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=f0b18d54}}. The genus name references Atropos, the Greek Fate who severs the thread of life; the species epithet ''belladonna'' ("beautiful woman") recalls the Renaissance practice of instilling the plant's juice into the eyes to dilate the pupils, then considered a mark of beauty{{cite|pubmed=17575737|anchor=38a6e889}}. Greeks and Romans recognized the plant as a deadly poison, and ancient Egyptian medical sources document therapeutic aerosol use of related anticholinergic compounds dating back approximately 3,500 years{{cite|doi=10.1089/jamp.2016.1297|anchor=89aa5477}}. In medieval Europe, belladonna served simultaneously as medicine, professional poison, and component of witchcraft preparations{{cite|pubmed=17575737|anchor=51655916}}. Fat-based "flying ointments" applied to mucous membranes delivered [[substance:scopolamine]] and hyoscyamine transdermally, producing vivid [[glossary:hallucination|hallucinations]] that users interpreted as supernatural flight{{cite|doi=10.1089/jamp.2016.1297|anchor=78ee4387}}{{cite|pubmed=16175141|anchor=d8170285}}. Compound preparations also served as surgical anaesthetics — pharmacological analysis of medieval "soporific sponge" formulations confirms their plausibility as genuinely active preparations{{cite|doi=10.1016/j.jep.2014.05.048|anchor=bfdb5525}}. ===Western discovery and pharmaceutical significance=== Isolation of pure L-atropine from belladonna in the 1830s proved a landmark for autonomic neuroscience{{cite|pubmed=17575737|anchor=f0e007e9}}. Atropine's capacity to block muscarinic effects of vagus nerve [[effect:stimulation]] led directly to identification of [[glossary:acetylcholine]] as a mammalian [[glossary:neurotransmitter]]{{cite|pubmed=17575737|anchor=3b8b307c}}. Inhaled belladonna preparations — burning dried [[glossary:plant-material]] and medicinal cigarettes — were widely prescribed for asthma throughout the 19th and early 20th centuries, establishing the anticholinergic bronchodilator drug class from which modern agents like ipratropium and tiotropium descend{{cite|doi=10.1089/jamp.2016.1297|anchor=ea5e2f78}}. ===Modern era=== Lacković (2017) documented a previously unreported tradition of intentional hallucinogenic use of belladonna berries in continental Croatia, known locally as "bunanje"{{cite|doi=10.24869/psyd.2017.379|anchor=ba7ca17f}}. A survey of recreational [[substance_class:psychoactive/hallucinogen]] users in Slovenia found knowledge of anticholinergic Solanaceae use largely lost, attributed to the experience's undesirable character and high [[glossary:toxicity]] risk{{cite|doi=10.1371/journal.pone.0247688|anchor=c7407a33}}. Atropine and scopolamine remain on the WHO List of Essential Medicines{{cite|doi=10.1007/s13659-022-00357-w|anchor=c45e2979}}. In 2016–2017, the U.S. [[glossary:fda]] issued safety alerts and requested a nationwide voluntary recall of Hyland's homeopathic teething tablets after [[glossary:laboratory-analysis]] found inconsistent and excessive belladonna alkaloid concentrations, with over 400 [[glossary:adverse-events]] including [[glossary:seizure|seizures]] in infants reported between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=55c18367}}.

===Discovery and early record=== Carl Linnaeus formally described and named ''Atropa belladonna'' in ''Species Plantarum'' (1753){{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=5aeba474}}. The genus name ''Atropa'' references Atropos, one of the three Fates in Greek mythology who cuts the thread of life, reflecting the plant's lethal potential. The species epithet ''belladonna'' ("beautiful woman" in Italian) references the historical cosmetic practice of instilling juice of the plant into the eyes to produce [[effect:pupil-dilation|mydriasis]] (pupil dilation), considered aesthetically desirable in Renaissance Italy{{cite|pubmed=17575737|anchor=557e1f31}}. Greeks and Romans recognized ''A. belladonna'' as a deadly poison, and ancient Egyptian medical sources reference therapeutic aerosol use of related anticholinergic compounds dating back approximately 3,500 years{{cite|doi=10.1089/jamp.2016.1297|anchor=4a7d8fc5}}{{flag|claim-unsupported}}. ===Medieval use: medicine, poison, and witchcraft=== In medieval Europe, belladonna occupied three intersecting domains: medicine, professional poisoning, and witchcraft{{cite|pubmed=17575737|anchor=c5df4f6e}}. The plant featured in fat-based "flying ointments" — preparations rubbed onto mucous membranes to enable transdermal [[glossary:absorption]] of [[substance:scopolamine]] and hyoscyamine, producing vivid hallucinatory experiences that users interpreted as flight or attendance at the sabbath{{cite|doi=10.1089/jamp.2016.1297|anchor=c060e596}}{{flag|claim-unsupported}}. Scopolamine's transdermal absorption — enabling psychotropic effects without the higher [[glossary:fatality]] risk of oral dosing — is pharmacologically confirmed{{cite|pubmed=16175141|anchor=72d3e48c}}. Compound preparations containing belladonna were also used as surgical anaesthetics in medieval medicine. Pharmacological analysis of these "soporific sponge" formulations has confirmed their plausibility as genuinely pharmacologically active preparations depending on composition{{cite|doi=10.1016/j.jep.2014.05.048|anchor=85b4f435}}. ===Pharmaceutical and neuroscience significance=== The pure alkaloid L-atropine was isolated from belladonna in the 1830s{{cite|pubmed=17575737|anchor=55fb6d50}}. This proved a landmark research tool: atropine's ability to block muscarinic effects of vagus nerve [[effect:stimulation]] led directly to the identification of [[glossary:acetylcholine]] as a mammalian [[glossary:neurotransmitter]] — a foundational discovery in autonomic neuroscience{{cite|pubmed=17575737|anchor=75bdd3a3}}. Inhaled belladonna preparations (burning dried [[glossary:plant-material]], medicinal cigarettes) were widely used to treat asthma and bronchial conditions throughout the 19th and early 20th centuries, giving rise to the modern anticholinergic bronchodilator drug class (ipratropium, tiotropium){{cite|doi=10.1089/jamp.2016.1297|anchor=a67212ec}}{{flag|claim-unsupported}}. ===Modern era=== Lacković (2017) documented a previously unreported tradition of intentional hallucinogenic use of belladonna berries in continental Croatia during the 20th century, referred to locally as "bunanje"{{cite|doi=10.24869/psyd.2017.379|anchor=0255b834}}. A survey of recreational [[substance_class:psychoactive/hallucinogen]] users in Slovenia found that knowledge of anticholinergic Solanaceae use has largely been lost, attributed to the undesirable character of the experience and high [[glossary:toxicity]] risk relative to other available substances{{cite|doi=10.1371/journal.pone.0247688|anchor=3495edba}}. Atropine and scopolamine remain on the WHO List of Essential Medicines{{cite|doi=10.1007/s13659-022-00357-w|anchor=e085ea01}}. In 2016–2017, the U.S. [[glossary:fda]] issued safety alerts and requested a nationwide voluntary recall of Hyland's homeopathic teething tablets after [[glossary:laboratory-analysis]] found inconsistent and excessive belladonna alkaloid concentrations, with over 400 [[glossary:adverse-events]] including [[glossary:seizure|seizures]] in infants reported between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=41fbe64b}}.

''Atropa belladonna'' L. belongs to the family Solanaceae — the nightshades — alongside ''Datura stramonium'' (jimsonweed), ''Hyoscyamus niger'' (henbane), tomato, and tobacco. The genus ''Atropa'' contains roughly four species; ''A. belladonna'' is the most pharmacologically significant. No subspecies are formally distinguished for psychoactive character, though alkaloid ratios vary by geographic population{{flag|citation-needed}}. The plant is native to southern and central Europe, northern Iran, and northwestern Africa. It favours shaded, calcareous soils — woodland clearings, hedgerows, and disturbed ground. Wild populations are locally common across its native range; commercial cultivation at scale is limited. ''A. belladonna'' grows 0.5–1.5 metres tall, with large ovate leaves up to 18 cm long. Its most recognizable and dangerous feature is the glossy black berry — roughly 1–1.5 cm across, borne in a persistent green calyx. The berries' sweet taste and resemblance to blueberries or cherries make them a significant accidental [[glossary:ingestion]] risk, particularly for children. All parts of the plant contain [[substance_class:chemical/tropane]] alkaloids.

The accepted binomial is ''Atropa bella-donna'' L. per Plants of the World Online (Kew), though the unhyphenated form ''Atropa belladonna'' predominates in pharmacological and medical literature{{cite|name=powo-belladonna|type=database|author=Royal Botanic Gardens Kew|year=2024|title=Atropa bella-donna L. — Plants of the World Online|anchor=35e63acd}}. The genus ''Atropa'' contains approximately four accepted species, of which ''A. belladonna'' is the most pharmacologically significant. One accepted subspecies exists: ''A. bella-donna'' subsp. ''caucasica'' (Kreyer) Avet., native to the Caucasus region. A yellow-fruited variety (''var. lutea'') is also documented. Published synonyms include ''Atropa lethalis'' Salisb., ''Belladona baccifera'' Lam., and ''Belladona trichotoma'' Scop. ''A. belladonna'' is a tall perennial herb (60–150 cm) growing in temperate biomes on disturbed calcareous (chalk and limestone) soils, field margins, hedgerows, open woodland, and scrubland. Key morphological markers include large ovate leaves, dull purple bell-shaped flowers (2.5–3 cm), and shiny black berries (approximately 1 cm diameter) that are notably sweet-tasting despite being highly toxic. The natural distribution spans Albania, Austria, Spain, Italy, Greece, the Caucasus, and northern Iran, with introduced populations in North America, Scandinavia, New Zealand, and Australia. The plant has been commercially cultivated for pharmaceutical alkaloid extraction in Central and Eastern Europe (particularly Germany, former Yugoslavia, and the former USSR), India, and parts of North America. ===Misidentification risks=== The sweet-tasting black berries present a significant [[glossary:misidentification]] hazard. Documented cases of [[effect:confusion]] include: * '''Caucasian whortleberry''' (''Vaccinium arctostaphylos''): a [[glossary:case-series]] in Turkey documents nine poisoning cases resulting from misidentification{{cite|doi=10.1177/0960327111407225|anchor=3711314c}} * '''Bilberry''' (''Vaccinium myrtillus''): two adults were severely poisoned after making pie from frozen belladonna berries mistaken for bilberries{{cite|pubmed=10944889|anchor=8af776bf}} * '''Woody nightshade''' (''Solanum dulcamara''): a distinct species producing solanine rather than [[substance_class:chemical/tropane]] alkaloids, which has been confused clinically{{cite|pubmed=9017490|anchor=fddf2d9b}} The wood of ''A. belladonna'' also contains high alkaloid concentrations — one documented [[glossary:case-report|case reports]] unilateral [[effect:pupil-dilation]] from a splinter of belladonna wood contacting the eye{{cite|pubmed=10863712|anchor=f3ddd3fe}}, highlighting that [[glossary:toxicity]] risk extends beyond berry and leaf [[glossary:ingestion]].

''Atropa belladonna'' L. belongs to the family Solanaceae (nightshades), which also includes ''Datura stramonium'' (jimsonweed), ''Hyoscyamus niger'' (henbane), tomato, and tobacco. The genus ''Atropa'' contains approximately four species, of which ''A. belladonna'' is the most pharmacologically significant. No subspecies or varieties are widely distinguished for psychoactive character, though alkaloid ratios vary by geographic population{{flag|citation-needed}}. The plant is native to southern and central Europe, northern Iran, and northwestern Africa. It favours shaded, calcareous soils in woodland clearings, hedgerows, and disturbed ground. Wild populations are locally common in suitable habitat across its native range; the plant is not commercially cultivated at scale but is occasionally grown as an ornamental or in specialist botanical gardens{{flag|citation-needed}}. ''A. belladonna'' is a branching perennial growing 0.5–1.5 metres tall, with ovate leaves up to 18 cm long arranged alternately on the stem. Flowers are solitary, bell-shaped, dull purple to greenish, approximately 2.5–3 cm in length{{flag|citation-needed}}. The fruit is the plant's most recognizable and most dangerous feature: a glossy black berry roughly 1–1.5 cm in diameter, borne in a persistent green calyx. The berries' sweet taste and resemblance to edible fruits such as blueberries or cherries make them an acute accidental [[glossary:ingestion]] risk, particularly for children. All parts of the plant contain [[substance_class:chemical/tropane]] alkaloids, with the highest concentrations in roots and ripe berries. Leaves are typically harvested during flowering for pharmaceutical preparations. The plant is perennial, regrowing from the rootstock each spring; alkaloid content varies by growth stage, soil conditions, and geographic origin.

The dominant alkaloid in fresh ''A. belladonna'' [[glossary:plant-material]] is '''(-)-hyoscyamine''' (L-hyoscyamine), the levorotatory [[glossary:enantiomer]] of atropine. L-hyoscyamine is approximately twice as potent as [[glossary:racemic-mixture]] atropine at [[glossary:muscarinic-acetylcholine-receptor|muscarinic receptors]]{{cite|doi=10.1007/s13659-022-00357-w|anchor=94e7b158}}. Upon drying and extraction, L-hyoscyamine partially racemizes to yield atropine (the (±)-mixture), meaning that processed plant material contains proportionally more racemic atropine than fresh tissue. The second major [[substance_class:chemical/tropane]] alkaloid is '''scopolamine''' (hyoscine), distinguished structurally from hyoscyamine by an epoxide ring. [[substance:scopolamine]] is synthesized exclusively in roots via the [[glossary:enzyme]] hyoscyamine 6β-hydroxylase (H6H), then transported to aerial parts{{cite|pubmed=17345349|anchor=d7ddf730}}. The full tropane alkaloid biosynthesis pathway — from putrescine through N-methylpyrrolinium, tropinone, tropine, littorine, and hyoscyamine to scopolamine — has been characterized in ''A. belladonna'' and reconstructed in engineered yeast{{cite|doi=10.1111/nph.16317|anchor=364d3044}}{{cite|doi=10.1038/s41586-020-2650-9|anchor=563bb3b3}}. ===Concentrations by plant part=== Alkaloid concentration varies significantly across plant organs. Roots are the primary biosynthesis site, with intact root tissue containing approximately 0.3 mg/g dry weight total alkaloids{{cite|pubmed=10989174|anchor=c65e9eec}}. GLC/GC-MS analysis identified 13 alkaloids in roots and 7 in aboveground parts; hygrines (hygrine, cuscohygrine) — early biosynthetic intermediates — are absent from aerial tissue, while norhyoscyamine and hyoscyamine N-oxide are present in shoots{{cite|pubmed=17345349|anchor=284ad474}}. UHPLC-Orbitrap analysis of seeds confirmed 338 mg/kg (0.034%) atropine and 32.1 mg/kg scopolamine{{cite|doi=10.1002/dta.2416|anchor=1a366014}}. In belladonna ointment preparations, concentrations reached 4,007 µg/kg atropine and 1,139 µg/kg scopolamine{{cite|doi=10.1002/dta.2416|anchor=bff2e3d0}}. Berry alkaloid content expressed per individual berry has not been precisely quantified in peer-reviewed literature{{flag|safety-citation-needed}}. ===Minor alkaloids=== UHPLC-Orbitrap screening identified multiple minor tropane alkaloids in belladonna seeds and preparations: tropine, apoatropine, aposcopolamine, tropinone, homatropine, anisodamine (0.04–1.36 µg/kg in preparations){{cite|doi=10.1002/dta.2416|anchor=d11281a2}}. '''Calystegines A, B, and C''' — polyhydroxylated nortropane alkaloids that function as glycosidase [[glossary:inhibitor|inhibitors]] — were detected at up to 33.1 µg/kg in homeopathic products{{cite|doi=10.1002/dta.2416|anchor=7993e818}}. These possess distinct biological activity from the muscarinic-blocking tropane alkaloids but their clinical significance at these concentrations is uncertain. Trace amounts of ecgonine and benzoylecgonine ([[substance:cocaine]]-pathway [[glossary:metabolite|metabolites]]) were also identified; these are toxicologically minor but forensically notable. ===Preparation effects on alkaloid profile=== Both hyoscyamine and scopolamine are water-soluble and survive aqueous extraction and cooking — [[glossary:plasma]] atropine has been confirmed after [[glossary:ingestion]] of cooked belladonna berries{{cite|pubmed=8632502|anchor=5b7ad7b3}}. Fat-based preparations enable transdermal [[glossary:absorption]], the pharmacological basis for historical topical ointment use. Methyl jasmonate treatment of seedlings increases hyoscyamine and scopolamine [[glossary:accumulation]] by upregulating TR-I and H6H gene [[glossary:expression]] in roots{{cite|doi=10.19540/j.cnki.cjcmm.20180726.018|anchor=608c0cbe}}, demonstrating that cultivation conditions can modulate alkaloid yield.

The two dominant alkaloids are atropine (the [[glossary:racemic-mixture]] form of hyoscyamine, produced during drying and processing) and [[substance:scopolamine]] (hyoscine). Both are [[substance_class:chemical/tropane]] alkaloids and both block [[glossary:acetylcholine]] [[glossary:receptor|receptors]] throughout the body and brain{{cite|doi=10.1021/acschemneuro.8b00615|anchor=3eca2969}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=1eaf9af2}}. In fresh plant tissue the natural form is (-)-hyoscyamine; racemization to atropine occurs during extraction and storage. Atropine and scopolamine work in concert but produce different effects. Atropine drives the peripheral profile — [[glossary:tachycardia]], dilated pupils, [[effect:dry-mouth]], inability to sweat. Scopolamine penetrates the brain more efficiently due to a single structural difference (an epoxide bridge) that increases its ability to cross the [[glossary:blood-brain-barrier]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=5bef05bf}}, giving it proportionally greater central effects — [[effect:sedation]], [[glossary:hallucination|hallucinations]], and [[effect:amnesia]] — at equivalent doses. The ratio of the two alkaloids varies across plant parts, populations, and growing conditions, modulating the balance of peripheral and central effects in any given preparation. The European Food Safety Authority set the safety threshold at 0.016 µg/kg body weight for the combined alkaloids{{cite|doi=10.2903/j.efsa.2013.3386|anchor=0db8c10d}} — for a 70 kg adult, roughly 1.1 µg total. Alkaloid content varies substantially across geographic populations, harvest timing, and processing methods; cooked berries retain full alkaloid content{{cite|pubmed=8632502|anchor=350d3f42}}. No consumer test can quantify belladonna alkaloids; confirmation requires GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=0630e194}}.

The dominant alkaloids of ''A. belladonna'' are atropine (the [[glossary:racemic-mixture]] form of L-hyoscyamine, produced upon extraction and processing) and [[substance:scopolamine]] (hyoscine). Both are [[substance_class:chemical/tropane]] alkaloids — bicyclic organic compounds sharing the 8-azabicyclo[3.2.1]octane skeleton — and both act as non-selective [[substance_class:pharmacological/muscarinic-acetylcholine-receptor-antagonist|muscarinic acetylcholine receptor antagonists]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=b977ae04}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=64a1f445}}. In fresh plant tissue, the natural form is (-)-hyoscyamine; racemization to dl-hyoscyamine (atropine) occurs during drying, extraction, and storage. Scopolamine differs from atropine by a single epoxide bridge, which increases [[glossary:lipophilicity]] and [[glossary:blood-brain-barrier]] penetration. This structural difference produces proportionally greater [[glossary:central-nervous-system]] effects — [[effect:sedation]], [[glossary:hallucination|hallucinations]], and [[effect:amnesia]] — at equivalent peripheral doses{{cite|doi=10.1021/acschemneuro.8b00615|anchor=296caaef}}. The two alkaloids work in concert: hyoscyamine/atropine dominates the peripheral anticholinergic profile ([[glossary:tachycardia]], [[effect:pupil-dilation]], anhidrosis), while scopolamine drives the central [[substance_class:psychoactive/deliriant]] and amnestic effects. The relative ratio of hyoscyamine to scopolamine varies across plant parts, populations, and growing conditions, modulating the balance between peripheral and central effects in any given preparation. The European Food Safety Authority established an acute reference dose (ARfD) of 0.016 µg/kg body weight for the combined sum of (-)-hyoscyamine and (-)-scopolamine{{cite|doi=10.2903/j.efsa.2013.3386|anchor=1844c78a}} — reflecting extreme [[glossary:potency]] at vanishingly low absolute doses. For a 70 kg adult, this equates to approximately 1.1 µg total. Alkaloid content varies substantially across geographic populations, harvest timing, soil composition, and processing method. Cooked berries retain full alkaloid content{{cite|pubmed=8632502|anchor=6932ef78}}, and commercial preparations show extreme batch-to-batch variability. No consumer-level chemical test reliably quantifies belladonna alkaloids; confirmation requires GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=9b1c5810}}.

===Where it acts=== Belladonna alkaloids block [[glossary:acetylcholine]] [[glossary:receptor|receptors]] (muscarinic type) across the brain and body{{cite|doi=10.1021/acschemneuro.8b00615|anchor=98a243f3}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=7697a28f}}. [[glossary:blockade]] in the [[glossary:cortex]] and [[glossary:hippocampus]] produces [[effect:cognitive-impairment]], memory [[glossary:disruption]], and [[effect:delirium]]. Blockade in the heart removes its natural braking mechanism, causing [[glossary:tachycardia]]. Blockade in glands and smooth muscle causes [[effect:dry-mouth]], inability to sweat, urinary retention, and loss of near vision{{cite|doi=10.1021/acschemneuro.8b00615|anchor=523f1327}}. ===What it changes=== Unlike [[glossary:serotonergic-psychedelics]], belladonna produces '''anticholinergic delirium''' — a state where [[glossary:hallucination|hallucinations]] are completely indistinguishable from reality, accompanied by profound [[effect:amnesia]] and total loss of self-[[glossary:awareness]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=50edc451}}. This is phenomenologically unlike any other hallucinogenic class. [[glossary:animal-model|Animal studies]] confirm dose-dependent disruption of movement, [[effect:anxiety]] responses, and social behaviour with both atropine and [[substance:scopolamine]]{{cite|doi=10.1016/j.bbr.2018.10.033|anchor=fa799246}}. {{DiscoverMore|Open Questions}} [[substance_class:psychoactive/deliriant|Deliriants]] remain the least-studied class of [[substance_class:psychoactive/hallucinogen|hallucinogens]] in neurological research{{cite|doi=10.1021/acschemneuro.8b00615|anchor=0c78bc42}}. No neuroimaging studies of whole belladonna preparations exist. The precise mechanisms driving the transition from peripheral anticholinergic effects to full delirium remain unresolved. {{/DiscoverMore}}

===Where it acts=== Belladonna alkaloids exert their principal effects through competitive [[glossary:blockade]] of [[glossary:muscarinic-acetylcholine-receptor|muscarinic acetylcholine receptors]] (M1, M2, M3) across the central and peripheral nervous systems{{cite|doi=10.1021/acschemneuro.8b00615|anchor=5ae3c77d}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=10a864d2}}. M1 blockade in the [[glossary:cortex]] and [[glossary:hippocampus]] drives [[effect:cognitive-impairment]], memory [[glossary:disruption]], and [[effect:delirium]]. M2 blockade in the heart removes vagal braking, producing [[glossary:tachycardia]]. M3 blockade in glands and smooth muscle causes [[effect:dry-mouth]], anhidrosis, urinary retention, and cycloplegia{{cite|doi=10.1021/acschemneuro.8b00615|anchor=a98f7a0c}}. [[substance:scopolamine]] crosses the [[glossary:blood-brain-barrier]] more efficiently than atropine due to its epoxide ring, producing stronger central effects — [[glossary:hallucination|hallucinations]], [[effect:sedation]], and [[effect:amnesia]] — at equivalent peripheral exposure{{cite|doi=10.1021/acschemneuro.8b00615|anchor=f8c74f5d}}. ===What it changes=== Unlike [[glossary:serotonergic-psychedelics]], belladonna produces '''anticholinergic delirium''' — a state where hallucinations are indistinguishable from reality rather than recognized as drug-induced, accompanied by profound amnesia and complete loss of metacognitive [[glossary:insight]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=15de095c}}. This makes it phenomenologically distinct from any other hallucinogenic class. Behavioural modelling in zebrafish has demonstrated dose-dependent disruption of locomotion, [[effect:anxiety]]-like behaviour, and social patterns with both atropine and scopolamine{{cite|doi=10.1016/j.bbr.2018.10.033|anchor=ea05ca8b}}. {{DiscoverMore|Open Questions}} [[substance_class:psychoactive/deliriant|Deliriants]] remain the least-studied class of [[substance_class:psychoactive/hallucinogen|hallucinogens]] in behavioural and neurological research{{cite|doi=10.1021/acschemneuro.8b00615|anchor=7aae90e2}}. No neuroimaging studies using whole belladonna plant preparations have been published. The precise neural [[glossary:circuit]] mechanisms underlying the transition from peripheral anticholinergic effects to full delirium — and why scopolamine produces proportionally greater central effects than atropine beyond simple [[glossary:lipophilicity]] differences — remain unresolved. {{/DiscoverMore}}

Belladonna [[glossary:intoxication]] is not a [[glossary:psychedelic-experience]] — it is an episode of complete [[effect:delirium]]. The person cannot recognize that anything unusual is happening. [[glossary:hallucination|Hallucinations]] are real to them; they interact with absent people, pull phantom insects from their skin, and perform actions they later cannot recall. The gap between a subthreshold dose and full delirium is narrow, unpredictable, and compounded by extreme alkaloid variability across plant parts and specimens. Belladonna occupies the same pharmacological territory as ''Datura stramonium'' (jimsonweed) and ''Hyoscyamus niger'' (henbane) — all three produce delirium via [[substance_class:chemical/tropane]] alkaloids. Compared to [[glossary:serotonergic-psychedelics]], the experience is consistently involuntary, terrifying, and amnestic rather than insightful or expansive. It is not meaningfully comparable to [[substance:cannabis]] or psilocybin in character or risk profile.

{{Warning}}No controlled human [[glossary:dose-finding-study|dose-finding studies]] exist for any ''A. belladonna'' preparation. All dose information below derives from toxicological [[glossary:case-report|case reports]] and forensic analyses. [[glossary:potency]] varies significantly across plant parts, individual plants, cultivation conditions, and harvest batches. The margin between pharmacological effect and life-threatening [[glossary:toxicity]] is exceptionally narrow for all preparations. No dose value in this section has been verified against a published dose-response study.{{/Warning}} Dose data for belladonna preparations cannot be presented in the standard threshold/light/common/strong/heavy format used for well-characterized substances. Published data consist exclusively of case-reported quantities associated with poisoning outcomes. The following preparation-specific information reflects what has been documented in clinical [[glossary:toxicology]] literature. See the Dose by preparation card for structured dose data where available. ===Raw berries (oral)=== The most common route of accidental exposure. Case reports document serious anticholinergic poisoning from [[glossary:ingestion]] of 20–25 berries in a 9-year-old child{{cite|pubmed=2330633|anchor=f5ac11e2}} and severe poisoning requiring ICU admission in adults{{cite|doi=10.1177/0960327111407225|anchor=c5221270}}. Onset occurs approximately 30–60 minutes after ingestion. [[glossary:peak]] central effects occur at 1–4 hours. Total duration of central effects spans 4–12 hours; [[effect:pupil-dilation]] can persist 24–72 hours or longer. Berry alkaloid content per individual berry has not been precisely quantified in peer-reviewed literature{{flag|safety-citation-needed}}. ===Cooked berries (oral)=== [[substance_class:chemical/tropane]] alkaloids survive cooking. [[glossary:plasma]] atropine was confirmed in two adults who consumed pie made from frozen belladonna berries mistaken for bilberries{{cite|pubmed=8632502|anchor=c0413fbb}}{{cite|pubmed=10944889|anchor=52b8d74a}}. Cooking does not reduce toxicity risk. The case involved berries collected in mid-winter and stored frozen, underscoring that seasonal timing does not reliably prevent accidental exposure. ===Dried leaf (oral)=== Traditionally used in herbal medicine and as source material for pharmaceutical extraction. The European Pharmacopoeia specifies a minimum of 0.30% total alkaloids in dried belladonna leaf{{flag|citation-needed}}. Alkaloid content ranges of approximately 0.3–1.0% dry weight have been reported, though peer-reviewed quantification of leaf-to-leaf variability is limited. Dried leaf was historically smoked or burned as an asthma treatment{{cite|doi=10.1089/jamp.2016.1297|anchor=22593ff6}}. ===Prepared extract or tincture (oral)=== Commercial preparations present extreme variability risk. One documented case involved ingestion of 50 mL of a commercially purchased ''A. belladonna'' preparation, equivalent to approximately 15 mg atropine, by a trained herbalist — resulting in acute anticholinergic syndrome requiring ICU admission and mechanical ventilation{{cite|doi=10.1136/bcr-2015-209333|anchor=838014dd}}. Standardization of alkaloid content cannot be assumed for any commercial belladonna extract or tincture. ===Topical ointment (transdermal)=== Historical "flying ointment" preparations used fat-based vehicles applied to mucous membranes to achieve transdermal alkaloid [[glossary:absorption]]. [[substance:scopolamine]]'s confirmed transdermal [[glossary:bioavailability]]{{cite|pubmed=16175141|anchor=d514cea1}} provides the pharmacological basis for this route. No quantitative dose data for traditional topical preparations exist in published literature. ===Homeopathic preparations=== UHPLC-Orbitrap analysis detected 4.57 µg/kg atropine and 2.56 µg/kg scopolamine in homeopathic products{{cite|doi=10.1002/dta.2416|anchor=3afd0b5d}}. These concentrations are pharmacologically inactive in most adults at labeled doses. However, [[glossary:fda]] [[glossary:laboratory-analysis]] found some products exceeded label claims significantly, and over 400 [[glossary:adverse-events]] including [[glossary:seizure|seizures]] in infants were reported in association with Hyland's teething tablets between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=d8516d3b}}. ===Dose modifiers=== Alkaloid concentration varies by plant part (roots > seeds > leaves > berries by weight), though berries are most frequently ingested due to their sweet taste and visual resemblance to edible fruits. Body weight and age are critical modifiers — children are markedly more vulnerable, with fatal pediatric doses documented below 10 mg atropine equivalent{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=57730d8b}}. Concurrent use of any anticholinergic [[glossary:medication]] produces [[glossary:additive-effects]]{{cite|doi=10.1007/s13659-022-00357-w|anchor=fb0a3da0}}.

Belladonna [[glossary:intoxication]] is fundamentally unlike other hallucinogenic experiences. Where [[glossary:serotonergic-psychedelics]] and [[substance_class:psychoactive/cannabinoid|cannabinoids]] preserve some degree of self-[[glossary:awareness]], belladonna abolishes the boundary between [[glossary:hallucination]] and reality entirely. Users do not recognize their [[glossary:perception|perceptions]] as drug-induced — they interact with shadow figures, converse with absent people, and perform actions they later cannot recall. The experience is not meaningfully dose-titrable: the gap between subthreshold exposure and full anticholinergic [[effect:delirium]] is narrow, unpredictable, and compounded by extreme variability in [[glossary:plant-material]] [[glossary:potency]] across preparations, plant parts, and individual specimens. Belladonna occupies the same pharmacological territory as ''Datura stramonium'' (jimsonweed) and ''Hyoscyamus niger'' (henbane) — the anticholinergic [[substance_class:psychoactive/deliriant]] Solanaceae. All three produce qualitatively similar delirium via [[substance_class:chemical/tropane]] alkaloids, though differing hyoscyamine-to-[[substance:scopolamine]] ratios modulate the balance between peripheral and central effects. Compared to serotonergic psychedelics, the experience is consistently reported as involuntary, terrifying, and amnestic rather than insightful or expansive — a distinction rooted in the [[glossary:receptor]] mechanism itself.

No controlled human [[glossary:dose-finding-study|dose-finding studies]] exist for any whole-plant belladonna preparation. The margin between pharmacological effect and life-threatening [[glossary:toxicity]] is exceptionally narrow — the EFSA acute reference dose is 0.016 µg/kg body weight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=f94570df}}, orders of magnitude below any dose associated with hallucinogenic effects. The information below describes documented preparation forms; it does not constitute dosing guidance. ====Raw berries==== '''Raw berries''' are the most commonly documented route of both accidental and intentional exposure. Individual berries contain variable alkaloid concentrations; fatal doses in children have been documented below 10 mg atropine equivalent{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=5e9b7fd7}}. The berries' sweet taste and resemblance to blueberries or cherries drives accidental paediatric [[glossary:ingestion]]. Cooked berries retain full alkaloid content; [[glossary:plasma]] atropine has been confirmed after ingestion of cooked berries{{cite|pubmed=8632502|anchor=81ef64c0}}. Onset after oral ingestion is typically 30–60 minutes; central effects persist 4–12 hours, with [[effect:pupil-dilation]] lasting 24–72 hours or longer. ====Dried leaf==== '''Dried leaf''' is the traditional pharmaceutical form, used historically in asthma cigarettes and soporific preparations{{cite|doi=10.1089/jamp.2016.1297|anchor=e7f7d29e}}. Alkaloid content varies substantially by harvest timing, geographic origin, and drying method. Inhalation of smoke from burning dried leaf produced bronchodilation via anticholinergic action in 19th-century medical practice. The European Pharmacopoeia includes official monographs for belladonna leaf{{cite|doi=10.2903/j.efsa.2013.3386|anchor=1e3cbfbb}}. ====Tinctures and herbal extracts==== '''Tinctures and herbal extracts''' concentrate alkaloids unpredictably. A prepared herbal extract (50 mL, equivalent to 15 mg atropine) caused anticholinergic syndrome requiring mechanical ventilation in an experienced herbalist{{cite|doi=10.1136/bcr-2015-209333|anchor=627a0193}}. Commercial extracts show extreme batch-to-batch variability, and no consumer-level test can verify alkaloid concentration{{cite|doi=10.1002/dta.2416|anchor=b4cc6713}}. ====Topical ointments==== '''Topical ointments''' (historical "flying ointments") applied to mucous membranes deliver [[substance:scopolamine]] and hyoscyamine transdermally{{cite|pubmed=16175141|anchor=ffc9ffe0}}. Scopolamine's confirmed transdermal [[glossary:absorption]] enables psychotropic effects without the higher [[glossary:fatality]] risk of oral dosing{{cite|pubmed=16175141|anchor=765a2f28}}. This route was historically favoured in medieval witchcraft preparations{{cite|doi=10.1089/jamp.2016.1297|anchor=fef8c85d}}. Per-preparation dose tiers cannot be reliably established for belladonna due to extreme alkaloid variability across specimens and batches. Dose data for the isolated alkaloids (atropine, scopolamine) are available on their respective compound pages.

====Toxicity==== No human [[glossary:lethal-dose|LD50]] has been established for ''A. belladonna'' or its primary alkaloids. The safety threshold is 0.016 µg/kg body weight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=400ad1cb}} — far below any lethal exposure. Fatal doses in children have been documented below 10 mg atropine equivalent{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=47a42732}}. Poisoning presents as dilated pupils, [[glossary:tachycardia|rapid heart rate]] (typically 100–150 bpm), hot dry flushed skin, inability to urinate, and progressing [[effect:delirium]]{{cite|doi=10.1155/2024/5411258|anchor=6edd0dd0}}{{cite|pubmed=22655106|anchor=2564788c}}. Published cases include raw leaf [[glossary:ingestion]] requiring ICU admission{{cite|doi=10.1155/2024/5411258|anchor=578532f2}}, a Turkish [[glossary:case-series]] documenting acute subdural hematoma, acute pancreatitis, and [[glossary:rhabdomyolysis]]{{cite|doi=10.1177/0960327111407225|anchor=7c951e7e}}, and a prepared herbal extract causing anticholinergic syndrome requiring mechanical ventilation{{cite|doi=10.1136/bcr-2015-209333|anchor=53a6ef54}}. The specific antidote is '''physostigmine''' (0.5–2 mg IV), a drug that restores [[glossary:acetylcholine]] signaling in the brain — administered in hospital settings only, with documented treatment failures{{cite|pubmed=10944889|anchor=a433b9d3}}. Commercial belladonna products present documented hazards. [[glossary:fda]] analysis of Hyland's teething tablets found alkaloid concentrations exceeding label claims; over 400 [[glossary:adverse-events]] in infants were reported between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=b7ec7741}}. [[glossary:contamination]] of herbal teas with [[substance_class:chemical/tropane]] alkaloids has caused severe poisoning despite GMP compliance{{cite|pubmed=28612694|anchor=45b3b597}}. Tropane alkaloid contamination has been found in buckwheat flour and other products when belladonna is co-harvested with edible plants{{cite|doi=10.3920/qas2013.0314|anchor=11455ebd}}. No consumer test can detect belladonna alkaloids; confirmation requires GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=fa044f03}}. ====Psychological Risks==== Anticholinergic delirium is consistently described as involuntary, terrifying, and dysphoric{{cite|doi=10.1155/2024/5411258|anchor=78a87500}}{{cite|pubmed=22655106|anchor=92ec7383}}{{cite|doi=10.1177/0960327111407225|anchor=86816371}}{{cite|doi=10.24869/psyd.2017.379|anchor=55804d1c}}. [[glossary:hallucination|Hallucinations]] are true — indistinguishable from reality — frequently involving shadow figures, phantom insects, and conversations with absent people{{cite|doi=10.1021/acschemneuro.8b00615|anchor=27f7a868}}. Users typically have no [[glossary:insight]] during the experience and profound [[effect:amnesia]] afterward. The clinical presentation can be indistinguishable from acute [[glossary:psychosis]]{{cite|pubmed=11109424|anchor=2ee0fc8f}}. Recreational [[substance_class:psychoactive/hallucinogen]] users specifically avoided anticholinergic plants due to their dysphoric and uncontrollable character{{cite|doi=10.1371/journal.pone.0247688|anchor=0ab79012}}. ====Tolerance & Dependence==== No published controlled studies document [[glossary:tolerance]] to belladonna alkaloids in humans. Some peripheral tolerance to atropine's cardiac effects has been observed with repeated therapeutic exposure, but no data address tolerance to central [[substance_class:psychoactive/deliriant]] effects. No [[glossary:dependence]] syndrome, compulsive use pattern, or [[glossary:withdrawal]] criteria have been described. The profound amnesia and consistent [[effect:dysphoria]] of anticholinergic [[glossary:intoxication]] significantly limit repeated use. ====Drug Interactions==== The most clinically significant interaction is additive '''anticholinergic burden'''. Tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], first-generation antihistamines, [[substance_class:chemical/phenothiazine]] [[substance_class:psychoactive/antipsychotic|antipsychotics]], antiparkinsonian agents, and bladder antispasmodics all block the same [[glossary:receptor|receptors]] — combining them with belladonna amplifies every anticholinergic effect{{cite|doi=10.1007/s13659-022-00357-w|anchor=326e6661}}. '''CYP3A inhibitors''' — ketoconazole, clarithromycin, erythromycin, and [[glossary:grapefruit-juice]] — inhibit the liver [[glossary:enzyme]] that breaks down [[substance:scopolamine]], increasing its concentration by approximately 42% and prolonging its effects{{cite|pubmed=16175141|anchor=49131bcb}}. '''CNS depressants''' — [[substance_class:psychoactive/opioid|opioids]], [[substance_class:chemical/benzodiazepine|benzodiazepines]], [[substance:alcohol]] — produce additive [[effect:sedation]] when combined with scopolamine{{cite|pubmed=16719539|anchor=7cb13757}}. '''Cholinesterase inhibitors''' (physostigmine, donepezil, rivastigmine) antagonize belladonna's effects. Physostigmine is the specific antidote for central anticholinergic syndrome{{cite|doi=10.1155/2024/5411258|anchor=b4d9b6a2}}{{cite|pubmed=22655106|anchor=40522445}}. A theoretical interaction with '''monoamine oxidase inhibitors''' (MAOIs) exists based on additive central mechanism, but no published [[glossary:case-report|case reports]] support this{{flag|citation-needed}}. No herb-[[glossary:drug-interaction]] studies for whole belladonna preparations exist; all interaction data are extrapolated from isolated alkaloid studies. ====Contraindications==== * '''Narrow-angle glaucoma''' (absolute): muscarinic [[glossary:blockade]] increases eye pressure, risking acute angle-closure crisis. * '''Cardiac arrhythmias or pre-existing tachycardia''' (absolute): belladonna significantly accelerates [[glossary:heart-rate]]; dangerous with pre-existing conduction abnormalities. * '''Prostatic hypertrophy or urinary obstruction''' (absolute): urinary retention is a direct effect. * '''Children''' (absolute): markedly more vulnerable due to lower body mass and higher [[glossary:central-nervous-system|CNS]] [[glossary:sensitivity]]; fatal paediatric doses below 10 mg atropine equivalent are documented{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=ceeb885c}}. * '''Pregnancy''' (relative): both alkaloids cross the placenta; clinical monitoring required{{cite|pubmed=16175141|anchor=66e78812}}. * '''Elderly''' (relative): increased sensitivity to anticholinergic cognitive effects. * '''Psychiatric history''' (relative): delirium may be especially distressing; the presentation mimics acute psychosis{{cite|pubmed=11109424|anchor=122e68f8}}. * '''Concurrent anticholinergic medications''' (relative): additive receptor blockade increases [[glossary:toxicity]] risk{{cite|doi=10.1007/s13659-022-00357-w|anchor=1de3bdbe}}.

====Toxicity==== No human [[glossary:lethal-dose|LD50]] has been established for ''A. belladonna'' or its primary alkaloids. The EFSA acute reference dose of 0.016 µg/kg body weight represents the threshold at which pharmacological effects begin in humans{{cite|doi=10.2903/j.efsa.2013.3386|anchor=5ffd3a27}} — orders of magnitude below lethal exposure. Fatal doses in children have been documented below 10 mg atropine equivalent{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=b86b4b47}}. The classic '''anticholinergic toxidrome''' presents as [[effect:pupil-dilation]], [[glossary:tachycardia]] (typically 100–150 bpm), dry flushed skin, [[glossary:hyperthermia]] from anhidrosis, urinary retention, absent bowel sounds, and [[effect:delirium]]{{cite|doi=10.1155/2024/5411258|anchor=c4b57fd8}}{{cite|pubmed=22655106|anchor=1902a2c0}}. Published cases include raw leaf [[glossary:ingestion]] requiring ICU admission{{cite|doi=10.1155/2024/5411258|anchor=2fcbd787}}, therapeutic administration to an 11-year-old producing central anticholinergic syndrome{{cite|pubmed=22655106|anchor=86c3836e}}, and a Turkish [[glossary:case-series]] documenting complications including '''acute subdural hematoma''', acute pancreatitis, and [[glossary:rhabdomyolysis]]{{cite|doi=10.1177/0960327111407225|anchor=7a7d3f7f}}. A prepared herbal extract (50 mL, equivalent to 15 mg atropine) caused anticholinergic syndrome requiring mechanical ventilation{{cite|doi=10.1136/bcr-2015-209333|anchor=743c03cc}}. '''Physostigmine''' (0.5–2 mg IV), a cholinesterase [[glossary:inhibitor]] that crosses the blood-brain barrier, is the specific antidote for central anticholinergic syndrome — though treatment failure has been documented{{cite|pubmed=10944889|anchor=fee94cb6}}. Physostigmine is contraindicated in patients with AV block, asthma, or peripheral vascular disease. Commercial belladonna-containing products present documented [[glossary:contamination]] and labelling hazards. [[glossary:fda]] [[glossary:laboratory-analysis]] of Hyland's homeopathic teething tablets found alkaloid concentrations exceeding label claims with significant batch-to-batch inconsistency; over 400 [[glossary:adverse-events]] including [[glossary:seizure|seizures]] in infants were reported between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=68ceff2b}}. Contamination of commercial herbal teas with [[substance_class:chemical/tropane]] alkaloids has caused severe anticholinergic poisoning despite GMP compliance{{cite|pubmed=28612694|anchor=f59853f2}}. Tropane alkaloid contamination has been documented in buckwheat flour, edible flowers, and other products when belladonna is co-harvested with edible plant material{{cite|doi=10.3920/qas2013.0314|anchor=f6ee67c0}}. No consumer-level chemical test reliably detects belladonna alkaloids; confirmation requires GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=646a5023}}. Specific data on pesticide residues, heavy metals, or mycotoxin contamination in belladonna preparations sold in commerce have not been identified in published literature{{flag|safety-citation-needed}}. ====Psychological Risks==== Anticholinergic delirium is consistently described as involuntary, terrifying, and dysphoric{{cite|doi=10.1155/2024/5411258|anchor=bf6f8b7f}}{{cite|pubmed=22655106|anchor=d3f86d59}}{{cite|doi=10.1177/0960327111407225|anchor=cac6cad8}}{{cite|doi=10.24869/psyd.2017.379|anchor=bfc37993}}. Users typically have no [[glossary:insight]] during the experience and profound [[effect:amnesia]] for it afterward. [[glossary:hallucination|Hallucinations]] are true hallucinations — indistinguishable from reality — frequently involving shadow figures, phantom insects, and conversations with absent persons{{cite|doi=10.1021/acschemneuro.8b00615|anchor=22154e22}}. The clinical presentation can be indistinguishable from acute [[glossary:psychosis]]; differential diagnosis includes neuroleptic malignant syndrome and [[glossary:serotonin-syndrome]]{{cite|pubmed=11109424|anchor=9b0da873}}. A survey of recreational [[substance_class:psychoactive/hallucinogen]] users in Slovenia found anticholinergic plants were specifically avoided because of the dysphoric and uncontrollable nature of the experience{{cite|doi=10.1371/journal.pone.0247688|anchor=0e29508a}}. ====Tolerance & Dependence==== No published controlled studies document [[glossary:tolerance]] development to belladonna alkaloids in humans. Clinical observation suggests some peripheral tolerance to atropine's cardiac effects with repeated therapeutic exposure, but no data address tolerance to central [[substance_class:psychoactive/deliriant]] effects specifically. No [[glossary:dependence]] syndrome, compulsive use pattern, or [[glossary:withdrawal]] criteria have been described for belladonna alkaloids in published literature. The profound amnesia and consistent [[effect:dysphoria]] of anticholinergic [[glossary:intoxication]] significantly limit compulsive [[glossary:redose|redosing]] behaviour. ====Drug Interactions==== The most clinically significant interaction is '''additive anticholinergic burden''' with other muscarinic [[glossary:antagonist]] [[glossary:medication|medications]] — including tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], first-generation antihistamines, [[substance_class:chemical/phenothiazine]] [[substance_class:psychoactive/antipsychotic|antipsychotics]], antiparkinsonian agents, and bladder antispasmodics. The mechanism is pharmacodynamic: competitive [[glossary:antagonism]] at the same muscarinic acetylcholine receptor population{{cite|doi=10.1007/s13659-022-00357-w|anchor=cc0eb122}}. '''CYP3A inhibitors''' (grapefruit juice, ketoconazole, clarithromycin, erythromycin) increase [[substance:scopolamine]] [[glossary:bioavailability]] by approximately 42% via [[glossary:inhibition]] of [[glossary:first-pass-metabolism|first-pass]] [[glossary:metabolism|hepatic metabolism]], with significantly prolonged [[glossary:tmax|time to peak concentration]]{{cite|pubmed=16175141|anchor=0f5a0388}}. This interaction applies to any scopolamine-containing preparation and is clinically relevant because it widens the exposure window for central effects. '''CNS depressants''' ([[substance_class:psychoactive/opioid|opioids]], [[substance_class:chemical/benzodiazepine|benzodiazepines]], [[substance:alcohol]]) produce additive [[effect:sedation]] when combined with scopolamine{{cite|pubmed=16719539|anchor=065e36b9}}. '''Cholinesterase inhibitors''' (physostigmine, donepezil, rivastigmine) antagonize belladonna alkaloid effects. Physostigmine is used therapeutically as the specific antidote for central anticholinergic syndrome{{cite|doi=10.1155/2024/5411258|anchor=7ced2844}}{{cite|pubmed=22655106|anchor=73f5f53b}}. A theoretical interaction with '''monoamine oxidase inhibitors''' (MAOIs) exists on the basis of additive central mechanism, but no published [[glossary:case-report|case reports]] or pharmacokinetic studies specific to belladonna support this{{flag|citation-needed}}. No published herb-[[glossary:drug-interaction]] studies for belladonna as a whole-plant preparation have been identified; all interaction data are extrapolated from studies of the isolated alkaloids. ====Contraindications==== '''Narrow-angle glaucoma''' (absolute): muscarinic antagonism increases intraocular pressure, risking acute angle-closure crisis. '''Cardiac arrhythmias or pre-existing tachycardia''' (absolute): tachycardia is a primary effect of M2 [[glossary:blockade]]; dangerous with pre-existing conduction abnormalities or tachyarrhythmias. '''Prostatic hypertrophy or urinary obstruction''' (absolute): urinary retention is a direct consequence of M3 [[glossary:receptor]] blockade. '''Pediatric populations''' (absolute): children are markedly more vulnerable due to lower body mass and higher [[glossary:central-nervous-system|CNS]] susceptibility. Fatal paediatric doses below 10 mg atropine equivalent are documented{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=dfb82ba9}}. The sweet taste and appearance of berries present additional accidental ingestion risk. '''Pregnancy''' (relative): both atropine and scopolamine cross the placenta; use requires clinical monitoring{{cite|pubmed=16175141|anchor=1c62ea3d}}. '''Elderly patients''' (relative): increased [[glossary:sensitivity]] to anticholinergic cognitive effects; cumulative anticholinergic burden is associated with increased [[effect:cognitive-impairment]] risk. '''Psychiatric history''' (relative): anticholinergic delirium may be particularly distressing in individuals with psychiatric [[glossary:vulnerability]]; presentation can mimic acute psychosis{{cite|pubmed=11109424|anchor=2445a50e}}. '''Concurrent anticholinergic medication''' (relative): additive muscarinic blockade increases risk of severe anticholinergic [[glossary:toxicity]]{{cite|doi=10.1007/s13659-022-00357-w|anchor=ef1803cf}}.

No controlled human [[glossary:dose-finding-study|dose-finding studies]] exist for any whole-plant belladonna preparation. The margin between pharmacological effect and life-threatening [[glossary:toxicity]] is exceptionally narrow — the safety threshold is 0.016 µg/kg body weight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=b3326e1d}}, far below any dose associated with hallucinogenic effects. The preparations below document forms of exposure; they do not constitute dosing guidance. ====Raw berries==== '''Raw berries''' are the most common route of both accidental and intentional exposure. Individual berries contain variable alkaloid concentrations; fatal doses in children have been documented below 10 mg atropine equivalent{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=36527c43}}. The berries' sweet taste and resemblance to blueberries or cherries drives accidental paediatric [[glossary:ingestion]]. Cooked berries retain full alkaloid content — heating does not reduce toxicity{{cite|pubmed=8632502|anchor=a54aad60}}. Onset after oral ingestion is typically 30–60 minutes; central effects persist 4–12 hours, with dilated pupils lasting 24–72 hours or longer. ====Dried leaf==== '''Dried leaf''' is the traditional pharmaceutical form, used historically in asthma cigarettes and soporific preparations{{cite|doi=10.1089/jamp.2016.1297|anchor=ce2a045d}}. Alkaloid content varies substantially by harvest timing, geographic origin, and drying method. The European Pharmacopoeia includes official monographs for belladonna leaf{{cite|doi=10.2903/j.efsa.2013.3386|anchor=82601adf}}. ====Tinctures and herbal extracts==== '''Tinctures and herbal extracts''' concentrate alkaloids unpredictably. A prepared herbal extract equivalent to 15 mg atropine caused anticholinergic syndrome requiring mechanical ventilation in an experienced herbalist{{cite|doi=10.1136/bcr-2015-209333|anchor=e0b0056f}}. Commercial extracts show extreme batch-to-batch variability; no consumer test can verify alkaloid concentration{{cite|doi=10.1002/dta.2416|anchor=0b4c6db6}}. ====Topical ointments==== Historical '''flying ointments''' applied to mucous membranes delivered [[substance:scopolamine]] and hyoscyamine transdermally{{cite|pubmed=16175141|anchor=8636779a}}. Scopolamine's confirmed transdermal [[glossary:absorption]] produces psychotropic effects without the higher [[glossary:fatality]] risk of oral dosing{{cite|pubmed=16175141|anchor=01755330}}. This route was favoured in medieval preparations{{cite|doi=10.1089/jamp.2016.1297|anchor=442c4581}}. Per-preparation dose tiers cannot be reliably established due to extreme alkaloid variability across specimens and batches. Dose data for the isolated alkaloids are available on their respective compound pages.

===Forms & Identification=== Belladonna preparations cannot be reliably assessed for [[glossary:potency]] by appearance, smell, or taste. Alkaloid concentrations vary unpredictably across plant parts, geographic populations, harvest timing, and processing methods. No consumer-level [[glossary:reagent-kit|reagent test]] or field kit can detect or quantify [[substance_class:chemical/tropane]] alkaloids — confirmation requires [[glossary:laboratory-analysis]] by GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=6481dcd7}}. If encountering belladonna in commercial herbal products, a Certificate of Analysis from an ISO-accredited laboratory is the only meaningful quality indicator. Homeopathic and herbal products labelled as containing belladonna have been documented with alkaloid concentrations exceeding label claims{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=f412e985}}. ===Set & Setting=== Anticholinergic [[effect:delirium]] eliminates [[glossary:insight]], self-[[glossary:awareness]], and [[glossary:memory-formation]]. Unlike [[glossary:serotonergic-psychedelics]], there is no "[[glossary:set-and-setting]]" framework that meaningfully modulates the belladonna experience. Users will not recognize that they are intoxicated, will not remember the experience, and will not be able to make rational decisions during it. If exposure has occurred — whether intentional or accidental — the presence of a sober, informed companion who can recognize anticholinergic [[glossary:toxidrome]] signs and contact emergency services is the single most important [[index:harm-reduction|harm reduction]] measure. {{Guideline}} ===Guidelines=== * '''Do not use belladonna as a recreational substance.''' The margin between threshold effects and life-threatening [[glossary:toxicity]] is narrower than for virtually any other psychoactive plant preparation. No controlled [[glossary:dose-finding-study|dose-finding]] data exist. * '''Never combine''' with other anticholinergic [[glossary:medication|medications]] (tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], antihistamines, [[substance_class:psychoactive/antipsychotic|antipsychotics]]), [[glossary:cns-depressants]] ([[substance_class:psychoactive/opioid|opioids]], [[substance_class:chemical/benzodiazepine|benzodiazepines]], [[substance:alcohol]]), or CYP3A [[glossary:inhibitor|inhibitors]] ([[glossary:grapefruit-juice]], ketoconazole). * '''Keep all plant material away from children.''' The berries' sweet taste and resemblance to edible fruits make accidental paediatric [[glossary:ingestion]] a primary risk vector. * '''If you encounter belladonna in a herbal product''', verify alkaloid content via an ISO-accredited laboratory Certificate of Analysis before any use. * '''Cooked or processed berries retain full alkaloid content''' — heating does not reduce toxicity{{cite|pubmed=8632502|anchor=e81429d2}}. {{/Guideline}} {{Emergency}} ===Emergency Response=== '''Recognizing an emergency:''' Anticholinergic toxidrome signs include dilated pupils unresponsive to light, [[glossary:tachycardia|rapid heart rate]], hot dry flushed skin, inability to urinate, [[effect:confusion]] or [[glossary:agitation]] progressing to delirium, [[glossary:hallucination|hallucinations]], and [[glossary:seizure|seizures]]. '''Immediate steps:''' * '''1.''' Call emergency services immediately. Anticholinergic poisoning can be fatal and requires hospital-level intervention. * '''2.''' Do not attempt to induce [[effect:vomiting]]. * '''3.''' Keep the person in a cool environment — [[glossary:hyperthermia]] from anhidrosis is a primary life-threatening complication. * '''4.''' Prevent the person from injuring themselves during delirium — they may attempt to leave, interact with phantom objects, or behave unpredictably. * '''5.''' Monitor breathing and [[glossary:heart-rate]] continuously until emergency services arrive. '''What to tell the dispatcher:''' Name the substance (belladonna / deadly nightshade), estimated amount consumed, time of ingestion, and current symptoms — especially heart rate, skin temperature, and mental state. [[glossary:good-samaritan-law|Good Samaritan laws]] providing legal protection for callers exist in many jurisdictions. '''Reversal agent:''' '''Physostigmine''' (0.5–2 mg IV) is the specific antidote for central anticholinergic syndrome, administered in hospital settings only. It is not available for lay administration. {{/Emergency}} {{Aftercare}} ===Aftercare & Integration=== Anticholinergic effects may persist for 12–24 hours after initial onset; [[effect:pupil-dilation]] can last 24–72 hours or longer. During recovery: * '''Hydrate actively''' — anticholinergic effects impair normal fluid regulation. * '''Avoid bright light''' — prolonged mydriasis causes [[effect:light-sensitivity]] and [[effect:visual-acuity-suppression]]. Sunglasses or dim environments reduce discomfort. * '''Do not drive or operate machinery''' until mydriasis has fully resolved and cognitive function has returned to baseline. * '''Expect amnesia''' — most people have little or no memory of the [[glossary:intoxication]] itself. [[glossary:disorientation]] and cognitive fog may persist for 24–48 hours after acute effects subside. * '''Seek medical evaluation''' if tachycardia, urinary retention, or confusion persist beyond 24 hours. {{/Aftercare}} {{Recovery}} ===Recovery & Support=== Belladonna does not produce [[glossary:physical-dependence]] or a [[glossary:withdrawal]]. Repeated intentional use is rare due to the consistently aversive nature of the experience. If you or someone you know has been exposed to belladonna — accidentally or intentionally — and is experiencing ongoing physical symptoms or psychological [[glossary:distress]]: * '''Poison Control''' (US): 1-800-222-1222 (available 24/7) * '''SAMHSA National Helpline''' (US): 1-800-662-4357 (free, confidential, 24/7) * '''NHS 111''' (UK): for non-emergency medical advice after exposure * '''Emergency services''' (all jurisdictions): if symptoms of anticholinergic toxicity are present For individuals who have used belladonna intentionally and are considering further use, contact a healthcare provider or harm reduction service for individualised guidance. {{/Recovery}}

===Forms & Identification=== Belladonna preparations cannot be assessed for [[glossary:potency]] by appearance, smell, or taste. No consumer-level [[glossary:reagent-kit|reagent test]] or field kit can detect or quantify [[substance_class:chemical/tropane]] alkaloids — confirmation requires [[glossary:laboratory-analysis]] by GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=7344ed2c}}. For commercial products, a Certificate of Analysis from an ISO-accredited laboratory is the only meaningful quality indicator. Homeopathic and herbal products labelled as belladonna-containing have been documented with alkaloid concentrations exceeding label claims{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=8edbd6e5}}. ===Set & Setting=== Anticholinergic [[effect:delirium]] eliminates [[glossary:insight]], self-[[glossary:awareness]], and [[glossary:memory-formation]]. There is no "[[glossary:set-and-setting]]" framework that meaningfully modulates the belladonna experience. Users will not recognize their [[glossary:intoxication]], will not remember the experience, and cannot make rational decisions during it. If exposure has occurred — intentional or accidental — a sober, informed companion who can recognize anticholinergic [[glossary:toxidrome]] signs and contact emergency services is the single most important [[index:harm-reduction|harm reduction]] measure. {{Guideline}} ===Guidelines=== * Do not use belladonna as a recreational substance. The margin between threshold effects and life-threatening [[glossary:toxicity]] is narrower than for virtually any other psychoactive plant. No controlled [[glossary:dose-finding-study|dose-finding]] data exist. * Never combine with other anticholinergic [[glossary:medication|medications]] (tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], antihistamines, [[substance_class:psychoactive/antipsychotic|antipsychotics]]), [[glossary:cns-depressants]] ([[substance_class:psychoactive/opioid|opioids]], [[substance_class:chemical/benzodiazepine|benzodiazepines]], [[substance:alcohol]]), or drugs that inhibit [[substance:scopolamine]] [[glossary:metabolism]] ([[glossary:grapefruit-juice]], ketoconazole). * Keep all [[glossary:plant-material]] away from children. The berries' sweet taste and resemblance to edible fruits make accidental paediatric [[glossary:ingestion]] a primary risk. * Verify alkaloid content via an ISO-accredited laboratory Certificate of Analysis before any use of commercial herbal products. * Cooked or processed berries retain full alkaloid content — heating does not reduce toxicity{{cite|pubmed=8632502|anchor=b864c736}}. {{/Guideline}} {{Emergency}} ===Emergency Response=== '''Recognizing an emergency:''' Anticholinergic toxidrome signs include dilated pupils unresponsive to light, [[glossary:tachycardia|rapid heart rate]], hot dry flushed skin, inability to urinate, [[effect:confusion]] or [[glossary:agitation]] progressing to delirium, [[glossary:hallucination|hallucinations]], and [[glossary:seizure|seizures]]. '''Immediate steps:''' * '''1.''' Call emergency services immediately. Anticholinergic poisoning can be fatal and requires hospital-level intervention. * '''2.''' Do not attempt to induce [[effect:vomiting]]. * '''3.''' Keep the person in a cool environment — inability to sweat causes dangerous overheating. * '''4.''' Prevent the person from injuring themselves during delirium — they may attempt to leave, interact with phantom objects, or behave unpredictably. * '''5.''' Monitor breathing and [[glossary:heart-rate]] continuously until emergency services arrive. '''What to tell the dispatcher:''' Name the substance (belladonna / deadly nightshade), estimated amount consumed, time of ingestion, and current symptoms — especially heart rate, skin temperature, and mental state. [[glossary:good-samaritan-law|Good Samaritan laws]] providing legal protection for callers exist in many jurisdictions. '''Reversal agent:''' '''Physostigmine''' (0.5–2 mg IV) is the specific antidote for central anticholinergic syndrome, administered in hospital settings only. It is not available for lay administration. {{/Emergency}} {{Aftercare}} ===Aftercare & Integration=== Anticholinergic effects may persist for 12–24 hours after initial onset; dilated pupils can last 24–72 hours or longer. During recovery: * '''Hydrate actively''' — anticholinergic effects impair normal fluid regulation. * '''Avoid bright light''' — prolonged dilated pupils cause [[effect:light-sensitivity]] and [[effect:visual-acuity-suppression]]. Sunglasses or dim environments reduce discomfort. * Do not drive or operate machinery until pupils have returned to normal size and cognitive function has fully returned. * Expect [[effect:amnesia]] — most people have little or no memory of the intoxication itself. [[glossary:disorientation]] and cognitive fog may persist for 24–48 hours. * Seek medical evaluation if rapid heart rate, urinary retention, or confusion persist beyond 24 hours. {{/Aftercare}} {{Recovery}} ===Recovery & Support=== Belladonna does not produce [[glossary:physical-dependence]] or a [[glossary:withdrawal]]. Repeated intentional use is rare due to the consistently aversive nature of the experience. If exposure — accidental or intentional — has caused ongoing physical symptoms or psychological [[glossary:distress]]: * '''Poison Control''' (US): 1-800-222-1222 (available 24/7) * '''SAMHSA National Helpline''' (US): 1-800-662-4357 (free, confidential, 24/7) * '''NHS 111''' (UK): for non-emergency medical advice after exposure * '''Emergency services''' (all jurisdictions): if anticholinergic toxicity symptoms are present For individuals who have used belladonna intentionally and are considering further use, contact a healthcare provider or harm reduction service for individualised guidance. {{/Recovery}}

''A. belladonna'' is [[glossary:unscheduled|not scheduled]] under any United Nations drug convention — not the 1961 Single Convention on Narcotic Drugs, the 1971 [[glossary:convention-on-psychotropic-substances]], or the 1988 Convention Against Illicit Traffic. The plant is freely cultivable under international law, occupying a notable regulatory gap. Atropine and [[substance:scopolamine]] are prescription pharmaceuticals in most countries, but the plant itself is largely uncontrolled. In the United States, belladonna and all its parts are unscheduled under the [[glossary:controlled-substances-act]]; Louisiana is the sole US state that restricts [[glossary:possession]] for [[glossary:human-consumption]]{{cite|name=erowid-belladonna-law|type=web|author=Erowid|year=2024|title=Atropa belladonna Legal Status|anchor=35a6ce51}}. In the United Kingdom, the plant is not scheduled under the Misuse of Drugs Act, though its alkaloids require prescriptions as medicines{{flag|citation-needed}}. Germany and Australia regulate belladonna alkaloids as prescription pharmaceuticals while the plant itself falls under pharmaceutical or agricultural oversight{{cite|doi=10.2903/j.efsa.2013.3386|anchor=5ac2d31c}}. The [[glossary:fda]] took enforcement action against homeopathic belladonna products following safety alerts in 2010 and 2016, ultimately requesting a nationwide voluntary recall of Hyland's teething tablets in 2017 after documented alkaloid inconsistency{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=598e75e0}}. ===Detection=== Belladonna alkaloids are not detected by standard 5- or 10-panel workplace drug tests. Specific forensic testing can detect scopolamine in urine at 18 hours post-exposure and in hair at 5 weeks post-exposure{{cite|doi=10.1016/j.forsciint.2023.111678|anchor=f22ab0df}}. [[glossary:plasma]] atropine measurement is used clinically for management of acute belladonna poisoning{{cite|doi=10.1080/15563650903058906|anchor=e4c36ce8}}. {{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}}

''A. belladonna'' and its primary alkaloids (hyoscyamine, atropine, [[substance:scopolamine]]) are [[glossary:unscheduled|not scheduled]] under any United Nations drug convention — the 1961 Single Convention on Narcotic Drugs, the 1971 [[glossary:convention-on-psychotropic-substances]], or the 1988 Convention Against Illicit Traffic. The plant is freely cultivable under international law, occupying a notable regulatory gap given its significant psychoactive and toxic potential. Atropine and scopolamine are regulated as prescription pharmaceuticals in most jurisdictions, but the [[glossary:plant-material]] itself is largely uncontrolled.

Jurisdiction	Classification	Key provisions
United States (federal)	Unscheduled	Not controlled under the Controlled Substances Act. The plant and all parts are legal to cultivate, possess, and distribute. FDA regulates products claiming medicinal efficacy; prescription required for pharmaceutical atropine and scopolamine formulations{{cite|name=erowid-belladonna-law|type=web|author=Erowid|year=2024|title=Atropa belladonna Legal Status|anchor=806caaff}}
Louisiana (US state)	Restricted	Since August 2005, ''A. belladonna'' is illegal when intended for human consumption; possession for aesthetic, landscaping, or decorative purposes remains permitted{{cite|name=erowid-belladonna-law|type=web|author=Erowid|year=2024|title=Atropa belladonna Legal Status|anchor=be6ad094}}
United Kingdom	Not controlled	Not scheduled under the Misuse of Drugs Act 1971. The plant may be legally cultivated. Atropine and scopolamine require prescriptions under the Medicines Act but are not classified as controlled drugs{{flag|citation-needed}}
Germany	Pharmaceutical regulation	Belladonna leaf and root are available by prescription in German pharmacies. The European Pharmacopoeia includes official monographs for pharmaceutical use{{cite|doi=10.2903/j.efsa.2013.3386|anchor=1060b2db}}
Australia	Pharmaceutical regulation	Atropine is Schedule 4 (Prescription Only Medicine) under the Poisons Standard managed by the TGA. The plant itself may be subject to state-level noxious weed legislation{{flag|citation-needed}}
International treaties	Unscheduled	Not controlled under any UN drug convention (1961, 1971, or 1988). The plant occupies a regulatory gap: its alkaloids are prescription pharmaceuticals in most countries, but the plant itself is not internationally controlled

[[glossary:fda]] enforcement action against homeopathic belladonna products is notable. Following a safety alert in 2010 and a formal warning in 2016, the FDA requested a nationwide voluntary recall of all lots of Hyland's Baby Teething Tablets in April 2017 after [[glossary:laboratory-analysis]] confirmed inconsistent and excessive belladonna alkaloid concentrations{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=378d067a}}. ===Detection=== Belladonna alkaloids are not included in standard 5-panel or 10-panel workplace drug tests. Specific analytical testing must be ordered. In a forensic case, scopolamine was detected in urine at 41 µg/L at 18 hours post-exposure (blood was negative at the same timepoint) and in hair at 0.37 pg/mg at 5 weeks post-exposure{{cite|doi=10.1016/j.forsciint.2023.111678|anchor=7d97e68e}} — demonstrating a narrow urine [[glossary:detection]] window but significantly extended hair detection capability. [[glossary:plasma]] atropine measurement has been used for clinical management of acute belladonna poisoning{{cite|doi=10.1080/15563650903058906|anchor=691ba027}}.

===Primary receptor targets=== The dominant [[glossary:mechanism-of-action|pharmacological action]] of belladonna alkaloids is '''competitive antagonism at muscarinic acetylcholine receptors''' ([[glossary:muscarinic-acetylcholine-receptor|mAChRs]]). Both hyoscyamine/atropine and [[substance:scopolamine]] are non-selective muscarinic [[glossary:antagonist|antagonists]], blocking M1, M2, and M3 [[glossary:receptor-subtypes]]{{cite|doi=10.1021/acschemneuro.8b00615|anchor=73e1679f}}{{cite|doi=10.1007/s13659-022-00357-w|anchor=cacb6e78}}. M1 [[glossary:receptor]] [[glossary:blockade]] ([[glossary:cortex]], [[glossary:hippocampus]], autonomic ganglia) produces [[effect:cognitive-impairment]], memory [[glossary:disruption]], and [[effect:delirium]]. M2 receptor blockade (heart) removes vagal [[glossary:inhibition]], resulting in [[glossary:tachycardia]]. M3 receptor blockade (exocrine glands, smooth muscle) produces [[effect:dry-mouth]], anhidrosis, urinary retention, decreased gastrointestinal motility, and cycloplegia{{cite|doi=10.1021/acschemneuro.8b00615|anchor=d8b2b728}}. Scopolamine crosses the [[glossary:blood-brain-barrier]] more readily than atropine due to its epoxide ring, producing proportionally greater central effects — [[effect:sedation]], [[glossary:hallucination|hallucinations]], and [[effect:amnesia]] — at equivalent peripheral doses{{cite|doi=10.1021/acschemneuro.8b00615|anchor=014d32d2}}. ===Anticholinergic delirium=== Unlike [[glossary:serotonergic-psychedelics]], belladonna alkaloids produce '''anticholinergic delirium''' — a phenomenologically distinct hallucinogenic state. Characteristic features include true hallucinations (visual and auditory) that are indistinguishable from reality rather than recognized as drug-induced, profound anterograde and retrograde amnesia, [[effect:thought-disorganization]] rather than [[glossary:insight]]-generating cognition, and concurrent peripheral anticholinergic signs{{cite|doi=10.1021/acschemneuro.8b00615|anchor=78820e1e}}. Behavioral modeling in zebrafish has demonstrated dose-dependent disruption of locomotion, [[effect:anxiety]]-like behavior, and shoaling patterns with both atropine and scopolamine, supporting the translational relevance of preclinical [[substance_class:psychoactive/deliriant]] models{{cite|doi=10.1016/j.bbr.2018.10.033|anchor=b2e9a549}}. Deliriants remain the least-studied class of [[substance_class:psychoactive/hallucinogen|hallucinogens]] in terms of behavioral and neurological phenotyping{{cite|doi=10.1021/acschemneuro.8b00615|anchor=f51b05a3}}. ===Pharmacokinetics=== ====Atropine==== Atropine is well absorbed from the gastrointestinal tract (principally the upper small intestine); precise oral [[glossary:bioavailability]] has not been quantified in published human studies. [[glossary:plasma]] [[glossary:half-life]] is 2–4 hours, [[glossary:volume-of-distribution]] 1.0–1.7 L/kg, and [[glossary:protein-binding]] approximately 44%. [[glossary:metabolism|Hepatic metabolism]] produces atropin-N-oxide, noratropine, and tropic acid; 13–50% is excreted unchanged in urine{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=6f49fda9}}. Atropine crosses the blood-brain barrier and the placenta. ====Scopolamine==== Oral bioavailability is highly variable (3–27%) due to marked [[glossary:first-pass-metabolism]] via CYP3A. Oral tmax is approximately 0.5 hours{{cite|pubmed=16175141|anchor=92df5c00}}. Transdermal delivery (TTS patch) provides 0.5 mg over 72 hours, reaching a protective [[glossary:plasma-concentration]] of approximately 50 pg/mL at 6 hours and [[glossary:steady-state]] of approximately 100 pg/mL at 8–12 hours{{cite|pubmed=16719539|anchor=6190272d}}. Only 2.6% is excreted unchanged in urine, confirming extensive first-pass metabolism. [[glossary:grapefruit-juice]] (a CYP3A [[glossary:inhibitor]]) increases scopolamine AUC by approximately 42% and significantly prolongs tmax{{cite|pubmed=16175141|anchor=47c4198b}}. Both scopolamine and atropine cross the placenta; use in [[glossary:pregnancy]] requires monitoring{{cite|pubmed=16175141|anchor=23e982ed}}. ===Regulatory toxicology threshold=== The European Food Safety Authority established an acute reference dose (ARfD) of 0.016 µg/kg body weight for the sum of (-)-hyoscyamine and (-)-scopolamine, based on a human volunteer study demonstrating decreased [[glossary:heart-rate]] at this exposure level{{cite|doi=10.2903/j.efsa.2013.3386|anchor=e0aa0ebe}}. For a 70 kg adult, this equates to approximately 1.1 µg total — orders of magnitude below any dose associated with hallucinogenic effects. Dietary exposure in toddlers could exceed this ARfD by up to 7-fold{{cite|doi=10.2903/j.efsa.2013.3386|anchor=6b340a24}}. No neuroimaging studies using whole belladonna plant preparations as administered have been published.

The experiential character of belladonna [[glossary:intoxication]] is fundamentally distinguished from other hallucinogenic plant preparations by its anticholinergic mechanism. Where [[glossary:serotonergic-psychedelics]] and [[substance_class:psychoactive/cannabinoid|cannabinoids]] preserve some degree of metacognitive [[glossary:awareness]], belladonna produces a state in which the boundary between [[glossary:hallucination]] and reality is effectively abolished. The experience is not dose-titrable in any practical sense — the gap between subthreshold exposure and full anticholinergic [[effect:delirium]] is narrow and unpredictable, compounded by extreme variability in [[glossary:plant-material]] [[glossary:potency]] across preparations, plant parts, and individual specimens. Belladonna occupies the same pharmacological territory as ''Datura stramonium'' (jimsonweed) and ''Hyoscyamus niger'' (henbane) — the anticholinergic [[substance_class:psychoactive/deliriant]] Solanaceae. All three produce qualitatively similar anticholinergic delirium via the same [[substance_class:chemical/tropane]] alkaloid class, though relative hyoscyamine-to-[[substance:scopolamine]] ratios differ across species, modulating the balance between peripheral and central effects.

===Toxicity=== No human [[glossary:lethal-dose|LD50]] has been established for ''A. belladonna'' or its primary alkaloids. The EFSA acute reference dose (ARfD) of 0.016 µg/kg body weight for the sum of (-)-hyoscyamine and (-)-[[substance:scopolamine]] represents the threshold at which pharmacological effects (decreased [[glossary:heart-rate]]) begin in humans{{cite|doi=10.2903/j.efsa.2013.3386|anchor=b95c9cb7}} — orders of magnitude below lethal exposure. Fatal doses in children have been documented below 10 mg atropine equivalent{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=227b6bfa}}. Published [[glossary:case-report|case reports]] document severe [[glossary:toxicity]] across multiple preparation types. Raw leaf [[glossary:ingestion]] has caused anticholinergic syndrome requiring ICU admission{{cite|doi=10.1155/2024/5411258|anchor=9fc2e751}}. An 11-year-old was poisoned when belladonna was administered to her therapeutically for jaundice, developing central anticholinergic syndrome{{cite|pubmed=22655106|anchor=ae71ae9b}}. A series of nine poisonings in Turkey documented unusual complications including '''acute subdural hematoma''', acute pancreatitis, and [[glossary:rhabdomyolysis]]{{cite|doi=10.1177/0960327111407225|anchor=5f008195}}. A prepared herbal extract (50 mL, equivalent to 15 mg atropine) caused anticholinergic syndrome requiring mechanical ventilation in an experienced herbalist{{cite|doi=10.1136/bcr-2015-209333|anchor=fc8c6fa7}}. Cooked berries retain full alkaloid content; [[glossary:plasma]] atropine was confirmed after ingestion of cooked berries{{cite|pubmed=8632502|anchor=336c8a33}}. The classic '''anticholinergic toxidrome''' presents as: [[effect:pupil-dilation]], [[glossary:tachycardia]] (typically 100–150 bpm), dry flushed skin, [[glossary:hyperthermia]] (due to anhidrosis), urinary retention, absent bowel sounds, and [[effect:delirium]]{{cite|doi=10.1155/2024/5411258|anchor=baaebf30}}{{cite|pubmed=22655106|anchor=da1eb2bc}}. '''Physostigmine''' (0.5–2 mg IV), a cholinesterase [[glossary:inhibitor]] that crosses the blood-brain barrier, is the specific antidote for central anticholinergic syndrome, though its [[glossary:efficacy]] is not universal — one case report documents treatment failure{{cite|pubmed=10944889|anchor=5fdd74be}}. Physostigmine is contraindicated in patients with concurrent AV block, asthma, or peripheral vascular disease. ====Contaminant and adulterant risk==== Commercial belladonna-containing products present documented contamination and labeling hazards. [[glossary:fda]] laboratory analysis of Hyland's homeopathic teething tablets found alkaloid concentrations exceeding label claims with significant batch-to-batch inconsistency; over 400 [[glossary:adverse-events]] including [[glossary:seizure|seizures]] in infants were reported between 2006 and 2016{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=6716f686}}. Contamination of commercial herbal teas with [[substance_class:chemical/tropane]] alkaloids has caused severe anticholinergic poisoning despite GMP compliance{{cite|pubmed=28612694|anchor=0c2c076d}}. Tropane alkaloid contamination has been documented in buckwheat flour, edible flowers, and other herbal products when belladonna plants are co-harvested with edible plant material{{cite|doi=10.3920/qas2013.0314|anchor=aff99895}}. No consumer-level chemical test reliably detects belladonna alkaloids in preparations; confirmation requires GC-MS or LC-MS{{cite|doi=10.1002/dta.2416|anchor=4c4848b4}}. ===Psychological risks=== Anticholinergic delirium is consistently described in case reports as involuntary, terrifying, and dysphoric{{cite|doi=10.1155/2024/5411258|anchor=4203ec61}}{{cite|pubmed=22655106|anchor=58e1641c}}{{cite|doi=10.1177/0960327111407225|anchor=fd76ab4a}}{{cite|doi=10.24869/psyd.2017.379|anchor=bcb8d8ca}}. Unlike [[glossary:serotonergic-psychedelics|classic psychedelics]], users typically have no insight during the experience and profound [[effect:amnesia]] for it afterward. The [[glossary:hallucination|hallucinations]] are true hallucinations — indistinguishable from reality — frequently involving shadow-like figures, insects on surfaces, and conversations with absent persons{{cite|doi=10.1021/acschemneuro.8b00615|anchor=fb9d9c52}}. The clinical presentation can be indistinguishable from acute [[glossary:psychosis]]; differential diagnosis includes neuroleptic malignant syndrome and [[glossary:serotonin-syndrome]]{{cite|pubmed=11109424|anchor=5bd32a86}}. A survey of recreational [[substance_class:psychoactive/hallucinogen]] users in Slovenia found that anticholinergic plants were avoided specifically because of the dysphoric and uncontrollable nature of the experience{{cite|doi=10.1371/journal.pone.0247688|anchor=9b68e01c}}. ===Tolerance and dependence=== No published controlled studies document [[glossary:tolerance]] development to belladonna alkaloids in humans. Clinical observation suggests some peripheral tolerance to atropine's cardiac effects (tachycardia) with repeated therapeutic exposure, but no published data address tolerance to central [[substance_class:psychoactive/deliriant]] effects specifically. No [[glossary:dependence]] syndrome, compulsive use pattern, or [[glossary:withdrawal]] criteria have been described for belladonna alkaloids in published literature. The profound amnesia and consistent [[effect:dysphoria]] of the anticholinergic experience significantly limit compulsive [[glossary:redose|redosing]] behavior. ===Drug interactions=== The most clinically significant interaction class is '''additive anticholinergic burden''' with other muscarinic [[glossary:antagonist]] [[glossary:medication|medications]] — including tricyclic [[substance_class:psychoactive/antidepressant|antidepressants]], first-generation antihistamines, [[substance_class:chemical/phenothiazine]] [[substance_class:psychoactive/antipsychotic|antipsychotics]], antiparkinsonian agents, and bladder antispasmodics. The mechanism is pharmacodynamic (competitive M-[[glossary:antagonism|receptor antagonism]] at the same [[glossary:receptor]] population), and the interaction is well established at the receptor level{{cite|doi=10.1007/s13659-022-00357-w|anchor=5b8e3e6a}}{{flag|additional-citations-needed}}. '''CYP3A inhibitors''' (grapefruit juice, ketoconazole, clarithromycin, erythromycin) increase scopolamine [[glossary:bioavailability]] and AUC by approximately 42% via [[glossary:inhibition]] of [[glossary:first-pass-metabolism|first-pass]] [[glossary:metabolism|hepatic metabolism]], with significantly prolonged [[glossary:tmax]]{{cite|pubmed=16175141|anchor=174d4dff}}{{flag|additional-citations-needed}}. This interaction applies to any preparation containing scopolamine and is clinically relevant because it widens the exposure window for central effects. '''CNS depressants''' ([[substance_class:psychoactive/opioid|opioids]], [[substance_class:chemical/benzodiazepine|benzodiazepines]], [[substance:alcohol]]) produce additive [[effect:sedation]] when combined with scopolamine{{cite|pubmed=16719539|anchor=a8c451d1}}{{flag|additional-citations-needed}}. '''Cholinesterase inhibitors''' (physostigmine, donepezil, rivastigmine) antagonize belladonna alkaloid effects. Physostigmine is used therapeutically as the specific antidote for central anticholinergic syndrome{{cite|doi=10.1155/2024/5411258|anchor=8a0024c3}}{{cite|pubmed=22655106|anchor=433783ab}}. A theoretical interaction with '''monoamine oxidase inhibitors''' (MAOIs) exists on the basis of additive central mechanism, but no published case reports or pharmacokinetic studies specific to belladonna support this{{flag|citation-needed}}. No published herb-[[glossary:drug-interaction]] studies specifically for belladonna as a whole-plant preparation have been identified; all interaction data are extrapolated from studies of the isolated alkaloids. ===Contraindications=== '''Narrow-angle glaucoma''' (absolute): muscarinic antagonism increases intraocular pressure, risking acute angle-closure crisis. '''Cardiac arrhythmias or pre-existing tachycardia''' (absolute): tachycardia is a primary pharmacological effect of muscarinic M2 [[glossary:blockade]]; dangerous in individuals with pre-existing cardiac conduction abnormalities or tachyarrhythmias. '''Prostatic hypertrophy or urinary obstruction''' (absolute): urinary retention is a direct consequence of M3 receptor blockade in the detrusor muscle. '''Pediatric populations''' (absolute): children are markedly more vulnerable to belladonna toxicity due to lower body mass and higher [[glossary:central-nervous-system|CNS]] susceptibility. Fatal pediatric doses below 10 mg atropine equivalent are documented{{cite|name=statpearls-atropine|type=web|author=Rosenbaum SB, Gupta V, Patel P, Palacios JL|year=2024|title=Atropine — StatPearls|anchor=9197f045}}{{flag|additional-citations-needed}}. The sweet taste and appearance of the berries present additional accidental ingestion risk. '''Pregnancy''' (relative): both atropine and scopolamine cross the placenta; teratogenicity has not been established, but use during [[glossary:pregnancy]] requires clinical monitoring{{cite|pubmed=16175141|anchor=b2d18bd1}}{{flag|additional-citations-needed}}. '''Elderly patients''' (relative): greater [[glossary:sensitivity]] to anticholinergic cognitive effects; cumulative anticholinergic burden is associated with increased risk of [[effect:cognitive-impairment]]. '''Psychiatric history''' (relative): anticholinergic delirium may be particularly distressing and prolonged in individuals with psychiatric [[glossary:vulnerability]]; clinical presentation can mimic acute psychosis{{cite|pubmed=11109424|anchor=de179015}}{{flag|additional-citations-needed}}. '''Concurrent anticholinergic medication''' (relative): additive muscarinic blockade increases risk of precipitating severe anticholinergic toxicity{{cite|doi=10.1007/s13659-022-00357-w|anchor=adca0697}}{{flag|additional-citations-needed}}.

''A. belladonna'' and its primary alkaloids (hyoscyamine, atropine, [[substance:scopolamine]]) are [[glossary:unscheduled|not scheduled]] under the 1961 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 plant is freely cultivable under international law — a notable regulatory gap given its significant psychoactive and toxic potential. Atropine and scopolamine are regulated as prescription pharmaceuticals in most jurisdictions, but the [[glossary:plant-material]] itself is largely uncontrolled.

Jurisdiction	Classification	Key provisions
United States (federal)	Unscheduled	Not controlled under the Controlled Substances Act. The plant and all parts are legal to cultivate, possess, and distribute without a DEA license. FDA regulates products claiming medicinal efficacy; prescription required for pharmaceutical atropine and scopolamine formulations{{cite|name=erowid-belladonna-law|type=web|author=Erowid|year=2024|title=Atropa belladonna Legal Status|anchor=abde9e63}}
Louisiana (US state)	Restricted	Since August 2005, ''A. belladonna'' is illegal when intended for human consumption; possession for aesthetic, landscaping, or decorative purposes remains permitted{{cite|name=erowid-belladonna-law|type=web|author=Erowid|year=2024|title=Atropa belladonna Legal Status|anchor=6dd63aef}}
United Kingdom	Not controlled	Not scheduled under the Misuse of Drugs Act 1971. The plant may be legally cultivated as an ornamental. Atropine and scopolamine require prescriptions under the Medicines Act but are not classified as controlled drugs (not in Classes A, B, or C){{flag|citation-needed}}
Germany	Pharmaceutical regulation	Belladonna leaf and root are available by prescription in German pharmacies. The European Pharmacopoeia includes official monographs for belladonna leaf and root for pharmaceutical use{{cite|doi=10.2903/j.efsa.2013.3386|anchor=04c52b7b}}
Australia	Pharmaceutical regulation	Atropine is Schedule 4 (Prescription Only Medicine) under the Poisons Standard managed by the TGA. The plant itself may be subject to state-level noxious weed legislation{{flag|citation-needed}}
International treaties	Unscheduled	Not controlled under any UN drug convention (1961, 1971, or 1988). The plant occupies a regulatory gap: its alkaloids are prescription pharmaceuticals in most countries, but the plant itself is not internationally controlled

[[glossary:fda]] enforcement action against homeopathic belladonna products is notable. Following a safety alert in 2010 and a formal warning in 2016, the FDA requested a nationwide voluntary recall of all lots of Hyland's Baby Teething Tablets in April 2017 after [[glossary:laboratory-analysis]] confirmed inconsistent and excessive belladonna alkaloid concentrations{{cite|name=fda-belladonna-2017|type=web|author=U.S. Food and Drug Administration|year=2017|title=FDA Warns Consumers About Homeopathic Teething Products|anchor=5328a968}}. ===Detection=== Belladonna alkaloids are not included in standard 5-panel or 10-panel workplace drug tests (SAMHSA immunoassay panels). Specific analytical testing must be ordered. In a forensic case involving [[glossary:drug-facilitated-sexual-assault]], scopolamine was detected in urine at 41 µg/L at 18 hours post-exposure (blood was negative at the same timepoint) and in hair at 0.37 pg/mg at 5 weeks post-exposure{{cite|doi=10.1016/j.forsciint.2023.111678|anchor=4094acc8}}. This demonstrates a narrow urine [[glossary:detection]] window for scopolamine but a significantly extended hair detection capability. [[glossary:plasma]] atropine measurement has been used for clinical management of acute belladonna poisoning{{cite|doi=10.1080/15563650903058906|anchor=3ec2cb58}}.