25E-NBOH
4-ethyl-2,5-dimethoxy-N-(2-hydroxybenzyl)phenethylamine
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25E-NBOH (2C-E-NBOH) is a synthetic psychedelic of the phenethylamine class. It is a close chemical relative of 2C-E, modified by the addition of an N-benzyl group that makes it active at far lower doses. It activates serotonin receptors in the brain,[1] producing the visual distortions and cognitive shifts characteristic of classical psychedelics.
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The NBOH scaffold was developed around 2009–2010 by Martin Hansen to create brain-imaging agents for serotonin receptors.[2] When related NBOMe compounds were banned in the United States in 2013, the NBOH series entered recreational markets as a legal alternative. 25E-NBOH appeared around 2018–2019 and remains unscheduled under international treaties, though several countries have banned it individually.[3]
Subjective effects include geometric visual patterns, brightened colors, cognitive stimulation, analytical clarity, and heightened verbal fluency. The experience is unusually lucid — perception becomes dramatically altered while the capacity to think and speak stays largely intact, distinguishing it from the cognitive dissolution characteristic of high-dose tryptamines. Muscle tension, cold extremities, nausea, and a diffuse physical pressure from vasoconstriction are characteristic unwanted effects.
25E-NBOH does not produce physical dependence, but its toxic dose in humans is unknown, and at least one source references fatal cases.[4] The primary dangers are cardiovascular: blood vessel constriction can drive dangerous blood pressure elevation, and the class carries documented risk of seizures and fatal overheating.[5] The evidence base is thin — one animal study, metabolic profiling, and community reports.
History[edit]
Discovery
The parent 2C-E was first documented by Alexander Shulgin.[6] The NBOH modification was developed around 2009–2010 by Martin Hansen, who was building molecular tools for imaging serotonin receptors in living brain tissue.[2] 25CN-NBOH emerged as the most pharmacologically significant compound in that program;[7][8] 25E-NBOH received less individual study.
Market Emergence and Forensic Detection
When several NBOMe compounds were placed into Schedule I in the United States in 2013,[9] the NBOH series entered recreational markets as a legal alternative. 25E-NBOH appeared around 2018–2019,[3] first identified by Brazilian police from seized blotter papers.[10][11]
Analytical Challenges
25E-NBOH breaks down into 2C-E under the heat of standard gas chromatography.[12][10] This likely caused its presence to be underreported in seized materials. Liquid chromatography or NMR methods are needed for reliable identification.
The name "25E-NBOH" follows systematic research chemical naming: "25" marks the 2,5-dimethoxy pattern, "E" the 4-ethyl group from 2C-E, and "NBOH" the N-(2-hydroxybenzyl) modification. This single functional group difference from NBOMe compounds — hydroxyl instead of methoxy — created a legally distinct identity while retaining comparable pharmacological potency.[9]
Chemistry[edit]
Structural Class
25E-NBOH belongs to the N-benzylphenethylamine class — a family of potent serotonergic psychedelics built from 2C-x phenethylamines with an N-benzyl group attached. It is derived from 2C-E; attaching the N-(2-hydroxybenzyl) group dramatically increases binding at serotonin receptors compared to 2C-E alone.[5] It differs from 25E-NBOMe by a single functional group — a hydroxyl instead of a methoxy on the benzyl ring — creating a pharmacologically and legally distinct compound.[9]
Molecular Properties
| Molecular formula | C₁₉H₂₅NO₃ |
| Molecular weight | 315.4 g/mol |
Physical Properties
A critical property is thermolability: 25E-NBOH breaks down into 2C-E under the heat of standard gas chromatography.[12][11][10] This is shared across the NBOH class and requires liquid chromatography or NMR for reliable identification.
Pharmacology[edit]
Mechanism of Action
25E-NBOH produces its effects by activating serotonin receptors in the brain.[1][5] It is a full agonist — binding tightly and triggering those receptors completely.[1] The exact cellular signaling route behind its psychedelic effects is still being worked out; the closely related compound 25CN-NBOH provides the closest structural reference for how this class works.[13][14][15]
A secondary mechanism drives the physical body load. The NBOH class also binds epinephrine receptors, causing blood vessels throughout the body to constrict.[16][17] This produces elevated blood pressure, tachycardia, cold extremities, and muscle tension.
Pharmacokinetics
No human pharmacokinetic data exist for 25E-NBOH. Studies in laboratory settings confirm that 2C-E is produced as a metabolite when the body breaks down 25E-NBOH.[3][4] The sublingual route partially bypasses liver breakdown — by analogy with closely related NBOH compounds, which show moderate susceptibility to liver metabolism.[18][9]
Neuroscience[edit]
Where It Acts
No direct brain imaging data exist for 25E-NBOH. Its neural effects are inferred from its confirmed activity at serotonin receptors.[1] Those receptors concentrate on neurons in the prefrontal cortex, where activation disrupts the brain's normal filtering of sensory information — producing enhanced perception, unusual associative thinking, and synesthesia-like phenomena.
Why It Matters
One influential framework proposes that psychedelics loosen the brain's top-down predictions, allowing raw sensory data to shape conscious experience more directly — consistent with the visual distortions and cognitive flexibility reported with 25E-NBOH. A related compound, 25C-NBF, has shown neuroplasticity-promoting and rapid antidepressant effects in rodents,[19] suggesting the broader N-benzylphenethylamine class may share the brain-rewiring capacity documented for classical psychedelics.
Several questions remain unanswered for 25E-NBOH: whether it promotes structural brain changes at sub-hallucinogenic doses, what its cellular signaling profile looks like compared to other NBOH compounds, and whether the metabolite 2C-E contributes meaningfully to the subjective experience. The compound's reportedly shorter duration compared to NBOMe analogs also raises the question of how long it remains bound to serotonin receptors — a measurement that has not been made for any NBOH compound.
Subjective Effects[edit]
The 25E-NBOH experience is defined by a tension between mental clarity and physical discomfort. Visual perception becomes dramatically altered — geometry, brightened colors, rippling surfaces — while analytical thinking and verbal fluency remain largely intact. Muscle tension, physical pressure, and cold extremities accompany the experience, driven by the compound's blood vessel-constricting secondary mechanism.
Compared to 2C-E, which requires milligram quantities and lasts considerably longer, 25E-NBOH is active at microgram doses with a shorter timeline. It is more stimulating and visually oriented than psilocybin, but carries a cardiovascular body load closer to the NBOMe series than to classical tryptamine psychedelics.
Effect Grid
Full psychedelic visual field emerges — visual drifting and morphing are prominent, geometric overlays appear on surfaces, color enhancement is vivid, and tracers follow moving objects. Internal hallucinations become accessible with closed eyes. Time alteration is pronounced; minutes may feel stretched or compressed unpredictably.
Cognitive effects include enhanced thought connectivity, pattern recognition enhancement, creativity enhancement, and introspective depth. The characteristic clear-headedness of 25E-NBOH is maintained — analytical capacity persists alongside perceptual disruption, distinguishing this from tryptamine psychedelics at equivalent intensity.
Vasoconstriction is notable at this tier — muscle soreness, cold extremities, and bodily pressure are commonly reported. Stimulation is pronounced. Temperature dysregulation may occur. Total duration is 4–6 hours.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Visual breathing · Tracers · Music enhancement · Brightness alteration · Environmental patterning · Symmetrical texture repetition · After-images · Auditory distortion · Auditory enhancement · Depth perception distortion · Light sensitivity · Perspective distortion · Sound sensitivity · Visual morphing · Touch enhancement · Visual acuity enhancement · Auditory misinterpretation · Peripheral vision distortion · Spatial disorientation · Visual diffraction · Visual haze / noise · Visual melting · Synesthesia · Peripheral misidentification · Proprioceptive distortion · Vestibular distortion · Olfactory enhancement · Taste enhancement · Visual processing acceleration · Visual magnification · Flashbacks · Object transformations · Internal hallucinations · Object activation · Visual recursion · Environmental orbism / cubism · External hallucinations · Visual scenery slicing · Auditory hallucinations · Perspective hallucinations · Visual flipping · Persisting hallucinations
Environmental patterning · Symmetrical texture repetition · After-images · Auditory distortion · Auditory enhancement · Depth perception distortion · Light sensitivity · Perspective distortion · Sound sensitivity · Visual morphing · Touch enhancement · Visual acuity enhancement · Auditory misinterpretation · Peripheral vision distortion · Spatial disorientation · Visual diffraction · Visual haze / noise · Visual melting · Synesthesia · Peripheral misidentification · Proprioceptive distortion · Vestibular distortion · Olfactory enhancement · Taste enhancement · Visual processing acceleration · Visual magnification · Flashbacks · Object transformations · Internal hallucinations · Object activation · Visual recursion · Environmental orbism / cubism · External hallucinations · Visual scenery slicing · Auditory hallucinations · Perspective hallucinations · Visual flipping · Persisting hallucinations
Spontaneous body sensations · Body high · Muscle tension · Wakefulness · Appetite suppression · Dry mouth · Tingling / electric sensations · Excessive sweating · Nausea · Dizziness · Headache · Heart rate perception changes · Insomnia · Laughter fits · Motor control impairment · Physical fatigue · Restlessness · Tactile euphoria · Vibrations / buzzing · Bruxism · Sexual arousal enhancement · Dehydration sensation · Bodily lightness · Bodily pressures · Body schema distortion · Breathing alteration · Salivation · Trembling · Abnormal heartbeat · Increased urination · Diarrhea · Involuntary body movements · Nystagmus (eye wobbles) · Vomiting · Motor control enhancement · Seizure threshold reduction · Bodily dissociation · Tactile hallucination
Wakefulness · Appetite suppression · Dry mouth · Tingling / electric sensations · Excessive sweating · Nausea · Dizziness · Headache · Heart rate perception changes · Insomnia · Laughter fits · Physical fatigue · Restlessness · Tactile euphoria · Vibrations / buzzing · Bruxism · Sexual arousal enhancement · Dehydration sensation · Bodily lightness · Bodily pressures · Body schema distortion · Breathing alteration · Salivation · Trembling · Abnormal heartbeat · Increased urination · Diarrhea · Involuntary body movements · Nystagmus (eye wobbles) · Vomiting · Motor control enhancement · Seizure threshold reduction · Bodily dissociation · Tactile hallucination
Conceptual thinking · Memory suppression · Thought connectivity · Immersion enhancement · Cognitive euphoria · Cognitive flexibility · Introspection enhancement · Multiple thought streams · Openness enhancement · Creativity enhancement · Thought acceleration · Cognitive fatigue · Cognitive impairment · Focus suppression · Humor enhancement · Increased nature relatedness · Memory fragmentation · Thought disorganization · Thought loops · Analysis enhancement · Information processing enhancement · Analysis suppression · Confusion · Information processing suppression · Memory replays · Motivation suppression · Synchronicity · Focus enhancement · Motivation enhancement · Cognitive dysphoria · Thought deceleration · Delusions of sobriety · Delusions · Amnesia
Immersion enhancement · Cognitive euphoria · Cognitive flexibility · Introspection enhancement · Multiple thought streams · Openness enhancement · Creativity enhancement · Thought acceleration · Cognitive fatigue · Cognitive impairment · Focus suppression · Humor enhancement · Increased nature relatedness · Memory fragmentation · Thought disorganization · Thought loops · Analysis enhancement · Information processing enhancement · Analysis suppression · Confusion · Information processing suppression · Memory replays · Motivation suppression · Synchronicity · Focus enhancement · Motivation enhancement · Cognitive dysphoria · Thought deceleration · Delusions · Amnesia
Simultaneous emotions · Anxiety · Empathy enhancement · Catharsis · Dysphoria · Irritability
Dysphoria · Irritability
Disinhibition · Social connection · Automaticity · Trust enhancement · Communication enhancement · Flow state · Sociability enhancement · Communication suppression · Sociability suppression · Social disconnection · Boundary dissolution · Cognitive disconnection · Ego dissolution · Identity alteration · Telepathic feelings
Communication enhancement · Flow state · Sociability enhancement · Communication suppression · Sociability suppression · Social disconnection · Boundary dissolution · Cognitive disconnection · Ego dissolution · Identity alteration · Telepathic feelings
Time cessation
Transpersonal memory access · Transpersonal visions · Entity contact
Anticipatory response · Recursive awareness
Timeline
First alerts emerge — mild stimulation, slight visual sharpening, awareness of blotter taste. Vasoconstriction may begin as faint peripheral tightness.
Progressive intensification of visual and somatic effects. Color enhancement becomes noticeable, geometric hints appear. Vasoconstriction establishes; transitional anxiety possible as intensity builds.
Full expression of visual, cognitive, and somatic effects. Geometry, color enhancement, visual drifting, and morphing at maximum intensity. Thought connectivity and pattern recognition prominent.
Gradual recession of visual effects; body load persists. Cognitive clarity returns before perceptual baseline. Stimulation remains notable.
Residual stimulation, mild mood elevation, and possible insomnia. Vasoconstriction resolves. Subtle perceptual brightness may linger.
Safety[edit]
- Acute toxicity
- Moderate
- Chronic toxicity
- Low
- Withdrawal
- None
- Tolerance buildup
- rapid
- Tolerance reset
- 14 days
- Physical
- None
- Psychological
- Negligible
- Compulsive redosing
- Negligible
- Dose escalation
- Negligible
- Cross-tol.
- LSD · psilo · mesc
Toxicity
No controlled toxicity data, lethal dose values, or safety margins exist for 25E-NBOH in any species.
One published source states that 25E-NBOH has caused fatal poisoning cases,[4] but provides no case numbers or clinical details. This is the only reference to fatalities from this specific compound. safety citation needed
Class-Level Risks
The NBOMe/NBOH class carries a characteristic toxicity pattern from overstimulation of the body's stress response system and excess serotonin activity. A review of 51 published cases identified these complications[5]:
- Seizures — documented across multiple compounds in the class
- Dangerous body temperature elevation — can trigger muscle breakdown and organ failure
- Muscle breakdown — linked to seizures, overheating, and sustained vasoconstriction
- Agitation and delirium — including violent behavior and complete disorientation
- Multi-organ failure — the terminal pathway in severe cases
NBOMe use has caused deaths.[17] Severe toxicity from blotter paper substances in this class has been documented clinically.[20]
Cardiovascular Effects
Adrenaline receptor binding — documented for the NBOMe class[16] — constricts blood vessels throughout the body. This produces high blood pressure, rapid heart rate, and reduced blood flow to the extremities. The serotonin component adds further cardiovascular risk through coronary vessel constriction.[21]
Analytical Misidentification
25E-NBOH breaks down into 2C-E under standard laboratory testing conditions,[12][10] and 2C-E is also produced as a metabolite in the body.[3] A positive test for 2C-E cannot distinguish between 2C-E use and 25E-NBOH use — poisoning cases from 25E-NBOH may be misattributed to 2C-E.
Psychological Risks
No controlled data on psychological adverse events exist for 25E-NBOH. By class analogy with serotonergic psychedelics:
- Acute distress ("bad trip"): anxiety, paranoia, panic, and transient psychotic symptoms are expected at higher doses and in predisposed individuals. The compound's dose sensitivity increases the risk of accidental high-dose exposure.
- Persistent perceptual changes (HPPD): no case reports exist for 25E-NBOH, but risk is established at the class level.
- Psychosis precipitation: serotonin receptor activation can trigger acute psychotic episodes in individuals with predisposition to psychotic disorders.
- Agitation and delirium: documented for NBOMe class intoxications at high doses.[5]
Tolerance and Dependence
Tolerance
Rapid tolerance develops through downregulation — detectable within 24 hours of a single dose.[22] Repeated dosing over several days produces progressively diminished effects. Cross-tolerance exists between serotonergic psychedelics — 25E-NBOH use reduces the effects of LSD, psilocybin, mescaline, and other serotonin-acting psychedelics.
Dependence
No dependence studies have been conducted for 25E-NBOH.[1] Classical psychedelics show very low reinforcing potential in animal models — the related compound 25C-NBF produced no rewarding effects in rodents.[19] No evidence of compulsive use, physical dependence, or withdrawal exists for any NBOH compound.
Drug Interactions
MAOIs
MAOIs block the breakdown of serotonin in the body. Combining them with 25E-NBOH floods serotonin systems, risking a dangerous overloading response — overheating, seizures, and potentially death.[23] No safe combination protocol exists.
SSRIs and SNRIs
Chronic SSRI or SNRI use may blunt the effects of 25E-NBOH by reducing available serotonin receptors. The combined serotonergic state is complex and incompletely understood.[23]
Lithium
Lithium combined with serotonergic psychedelics has been associated with increased seizure risk in case reports. safety citation needed
Vasoconstrictive Substances
Combining 25E-NBOH with other substances that constrict blood vessels — amphetamines, cocaine, MDMA, ergotamines — adds to cardiovascular risk.[5] The combined effect can produce dangerous blood pressure elevation and severely reduced blood flow to extremities.
Seizure-Threshold-Lowering Agents
The class carries documented seizure risk. Combining with substances that independently lower seizure threshold — such as tramadol or bupropion — represents additive risk. safety citation needed
Contraindications
Absolute
- Concurrent MAOI use: serotonin syndrome risk is mechanistically certain and potentially fatal
- Seizure disorders: seizure threshold reduction is documented at class level[5][17]
- Cardiovascular disease: pre-existing high blood pressure, coronary artery disease, peripheral vascular disease, or structural heart defects — blood vessel constriction from adrenaline receptor activity poses direct risk[16]
Relative
- Personal or family history of psychotic disorders: serotonin receptor activation can trigger acute psychosis in predisposed individuals
- Concurrent lithium use: seizure risk elevation reported at class level
- Pregnancy: no reproductive safety data exist; effects of serotonin receptor activation during fetal development are unknown citation needed
- Concurrent stimulant use: additive cardiovascular risk from combined blood vessel constriction
Harm Reduction[edit]
Forms & Identification
25E-NBOH circulates on blotter paper that is visually indistinguishable from LSD, NBOMe compounds, and other substances active at microgram doses. No visual inspection can confirm identity or dose.
Reagent testing provides preliminary identification but cannot confirm purity or dose. The compound's thermolability can confuse heat-based analytical methods. Quantitative laboratory analysis is the only reliable way to confirm both identity and dose.
Guidelines
- Test every batch with reagent kits before use; consider laboratory analysis for quantitative confirmation
- Start with the lowest available dose — 25E-NBOH is highly dose-sensitive, and small differences in amount can produce substantially different experiences
- Use the sublingual route as intended; do not alter the route of administration
- Have a sober, trusted companion present throughout the experience
- Ensure access to a warm, comfortable environment — vasoconstriction can cause cold extremities and physical discomfort
- Keep a light meal available for after the experience; avoid eating heavily beforehand
- Allow a full recovery day afterward with no obligations
- Wait at least two weeks between uses to allow full tolerance reset
Set & Setting
The clear-headed quality of 25E-NBOH does not reduce psychological risk. Cognitive lucidity can coexist with intense perceptual distortion and emotional intensity. A calm, familiar environment with a trusted sober companion provides the strongest foundation for a manageable experience.
The pronounced body load — muscle tension, cold extremities, physical pressure — is pharmacologically intrinsic. It is not a sign that something has gone wrong. Knowing this in advance reduces the likelihood of anxiety escalating in response to physical discomfort.
Aftercare & integration. Vasoconstriction-related body load may leave residual muscle soreness for 12–24 hours. Gentle movement, hydration, and warmth help with physical recovery. Adequate sleep the following night is important — the stimulating quality of the compound may make falling asleep difficult on the day of use.
Psychedelic experiences can surface unexpected emotional material. Journaling, conversation with a trusted person, or professional integration support can help process the experience. If distressing perceptual changes — visual haze / noise, trailing, pattern recognition in blank surfaces — persist beyond a few days, consult a healthcare provider familiar with HPPD.
Recovery & Support
25E-NBOH does not produce physical dependence, but patterns of frequent psychedelic use can become psychologically habitual. If use is escalating in frequency, occurring in response to emotional distress rather than intentional exploration, or causing conflict in daily life, professional support is appropriate.
Resources include psychedelic-informed therapists, harm reduction services such as DanceSafe and The Loop, and general substance use support through SAMHSA's National Helpline (1-800-662-4357).
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency: Uncomfortable physical effects — muscle tension, nausea, mild anxiety — are common and do not alone constitute an emergency. Seek immediate help if any of the following occur: seizure activity, loss of consciousness, chest pain, extreme body temperature (skin very hot to the touch), severe confusion or violent agitation, or sustained panic that cannot be talked through.
Immediate steps:
- 1. Call emergency services immediately if seizure, unconsciousness, chest pain, or dangerous body temperature is present
- 2. Keep the person in a cool, quiet environment
- 3. If conscious, encourage slow breathing and provide calm reassurance
- 4. If unconscious and breathing, place in the recovery position (on their side)
- 5. Do not restrain the person unless they are in immediate danger of harming themselves
- 6. Do not induce vomiting
What to tell the dispatcher: Name the substance (25E-NBOH or "a synthetic psychedelic from the NBOH class"), the approximate time of ingestion, the dose if known, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
No reversal agent exists for 25E-NBOH or any serotonergic psychedelic. Treatment is supportive.
Legal Status[edit]
25E-NBOH is not scheduled under any United Nations drug control conventions,[11] leaving regulation to individual nations.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United Kingdom | Class A (Misuse of Drugs Act 1971) | Controlled under the N-benzylphenethylamine catch-all clause; possession and supply are serious criminal offences[24] |
| Brazil | Scheduled (~Dec 2018) | Explicitly controlled following forensic identification of NBOH compounds in seized blotter papers[11][24] |
| Canada | Controlled (CDSA) | Captured under blanket phenethylamine language in the Controlled Drugs and Substances Actcitation needed |
| United States | Not explicitly scheduled | Potentially subject to prosecution under the Federal Analogue Act (21 USC §813) as structurally similar to Schedule I substancescitation needed |
| Australia | Unverified | May be captured under generic phenethylamine scheduling; specific verification unavailablecitation needed |
| European Union | Varies by member state | Germany, Sweden, and other member states have scheduled specific NBOH compounds; no EU-wide scheduling confirmed |
Analog Act Considerations
In the United States, the Federal Analogue Act extends controls to substances structurally similar to a scheduled compound when intended for human consumption. 25E-NBOH is structurally analogous to 25I-NBOMe (Schedule I since 2013) and pharmacologically similar in mechanism and potency. Prosecution under this act is legally plausible but has not been tested specifically for 25E-NBOH.
Legal status for research chemicals changes frequently and varies by jurisdiction. This information may not reflect current law. It is not legal advice.
references
- [1]
- [2] ^abEttrup A, Hansen M, Santini MA, Paine J, Gillings N, Palner M, Lehel S, Herth MM, Madsen J, Kristensen J, Begtrup M, Knudsen GM (2011) Radiosynthesis and in vivo evaluation of a series of substituted 11C-phenethylamines as 5-HT2A agonist PET tracers — European Journal of Nuclear Medicine and Molecular Imaging doi:10.1007/s00259-010-1686-8
- [3] ^abcdVágnerová M, Palivec P, Mrnává M et al. (2026) Metabolic profile of 25E-NBOH in human liver microsomes, rat urine, and fungus Cunninghamella elegans — Journal of Pharmaceutical and Biomedical Analysis doi:10.1016/j.jpba.2026.117417
- [4] ^abcXiang J, Wen D, Zhai W, Zhao J, Xiang P, Ma C, Shi Y (2024) Metabolic characterization of 25X-NBOH and 25X-NBOMe phenethylamines based on UHPLC-Q-Exactive Orbitrap MS in human liver microsomes. — Journal of Pharmaceutical and Biomedical Analysis doi:10.1016/j.jpba.2024.116020
- [5]
- [6]