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NMDA receptor antagonistethanol, benzodiazepines, barbiturates +2 moreethanol, benzodiazepines, barbiturates, neurosteroids, other GABA-A PAMs show less
2M2B
2-methyl-2-butanol
2M2B (tert-amyl alcohol) is a synthetic depressant of the tertiary alcohol class. It is roughly 20 times more potent than ethanol by weight,[1] making it a far stronger relative of drinking alcohol. It boosts the brain's main inhibitory signaling system while suppressing excitatory activity, producing prolonged, alcohol-like sedation.[2]
2M2B (tert-amyl alcohol) is a synthetic depressant of the tertiary alcohol class. It is approximately 20 times more potent than ethanol by weight.[1] 2M2B is a GABA-A positive allosteric modulator and NMDA antagonist, producing its effects by amplifying inhibitory neurotransmission while suppressing excitatory signaling.[2]
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First described in 1888 by D.W. Yandell as a hypnotic agent,[3] 2M2B saw brief medical use before safer drugs replaced it. It resurfaced in the late 2000s on internet drug forums, marketed in Eastern Europe as a cheap, hangover-free substitute for alcohol.[4] Today it remains unscheduled as a drug in most countries and undetectable by standard toxicology screens.
Subjective effects include sedation, anxiety relief, euphoria, loss of motor control, and cognitive suppression. The experience resembles a prolonged, intensified alcohol intoxication — cleaner in character due to the absence of acetaldehyde, the metabolite responsible for hangover.[5] At higher doses, delirium, memory blackouts, and compulsive redosing are characteristic unsought effects.
Physical dependence develops with repeated use, and respiratory failure is the primary life-threatening risk — published cases document collapse requiring emergency intubation.[6] The gap between intoxication and respiratory collapse is unknown, and standard toxicology screens cannot detect the compound, complicating emergency diagnosis and enabling concealed relapse. The evidence base consists entirely of case reports and in vitro work — no controlled human trials have been published.
History[edit]
Discovery
The pharmacological properties of 2-methylbutan-2-ol were first described in 1888 by D.W. Yandell, who called it amylene hydrate and characterized it as a novel hypnotic.[3] It entered limited clinical use as a sedative but never achieved wide adoption — chloroform, diethyl ether, and chloral hydrate already dominated the field.[7]
The Avertin era
In the 1930s, tert-amyl alcohol found a more specific role as a solvent in Avertin, a rectal anesthetic produced by Winthrop Laboratories.[7] Human use was discontinued as safer agents emerged; it persisted in animal laboratory work through the mid-20th century.[8]
Recreational re-emergence
2M2B resurfaced on internet drug forums in the late 2000s, concentrated in Eastern Europe, where it was promoted as a cheap, hangover-free, undetectable substitute for alcohol.[4] The first published case of acute intoxication appeared in 2014, documenting respiratory failure requiring emergency intubation.[6] Emergency presentations have continued to be documented through 2024.[1][9][10]
The name 2M2B became standard on English-language platforms including Reddit, Erowid, and Drugs-Forum.[11][1] In Eastern European markets, the compound was sold under the street name "Vodka," typically in 5 or 10 mL doses — packaging that reinforced the pitch of a stronger, cleaner alcohol substitute.[4]
Chemistry[edit]
Structural class
2M2B belongs to the tertiary aliphatic alcohols — a chemical family defined by a hydroxyl group attached to a carbon bearing three surrounding carbon chains and no hydrogen at that position. This structure means 2M2B cannot be broken down by alcohol dehydrogenase, the liver enzyme that converts ethanol into acetaldehyde.[8]
Molecular properties
The molecular formula is C₅H₁₂O (molecular weight 88.15 g/mol). The compound has a flash point of 19 °C, classifying it as a flammable liquid.[8] Trace quantities occur naturally as fermentation byproducts in alcoholic beverages, and the compound functions as a suckling pheromone in rabbit milk.[8]
Pharmacology[edit]
Mechanism of action
2M2B boosts inhibitory signaling by activating GABA receptors — the same general mechanism as alcohol, benzodiazepines, and barbiturates — producing sedation, anxiety relief, and motor impairment.[12] No substance-specific binding data have been published; understanding rests on class-level evidence from ethanol and related alcohols. inferred
It also suppresses excitatory signaling by blocking glutamate receptors. Among aliphatic alcohols, potency for this glutamate block correlates directly with overall intoxicating potency,[2] strongly suggesting 2M2B exerts substantially greater glutamate suppression than ethanol at equivalent doses.[13][14]
Pharmacokinetics
2M2B bypasses alcohol dehydrogenase entirely and is broken down by a different liver enzyme system.[5][15] The resulting metabolites are far less toxic than acetaldehyde, explaining the reduced hangover.[5] Elimination is slow — urinary metabolite half-lives range from 6 to 40 hours in humans,[16][17] consistent with the 8–14 hour intoxication duration documented in clinical cases.
Neuroscience[edit]
Where it acts
GABA receptor activity in the cerebral cortex reduces neural excitability, causing cognitive suppression and decision impairment. In the amygdala, the same inhibition dampens fear circuits, producing anxiety relief. Cerebellar disruption produces the loss of coordination documented in all clinical cases.[1][6]
At the brainstem, GABA activity in respiratory control centers causes dose-dependent respiratory depression — the primary fatal risk. Glutamate receptor blockade in the hippocampus impairs memory formation, directly producing the blackouts reported at higher doses.[2]
Tolerance and neuroadaptation
With chronic use, GABA receptors downregulate and glutamate receptors upregulate, creating hidden neural tension masked by the drug's presence.[12] Remove the drug abruptly and that tension becomes seizures, tremor, anxiety, and delirium.[18][19]
No neuroimaging or EEG studies have been conducted with 2M2B. Whether the 20-fold potency difference produces different GABA receptor adaptations than ethanol, and what the precise dose-response curve for respiratory depression looks like, both remain entirely uncharacterized. inferred
Subjective Effects[edit]
2M2B produces a prolonged, deep sedation — heavier than alcohol but with a subjectively cleaner character attributed to the absence of acetaldehyde, the metabolite responsible for hangover.[5] The dose window is extremely narrow: the gap between sociable warmth and incapacitating stupor spans only a few milliliters.
Among depressants, it sits between ethanol and GHB — more sedating and longer-lasting than alcohol, less sedating and with a wider dose margin than GHB.[20] It most closely resembles a prolonged, intensified alcohol intoxication without the hangover, but with a substantially different risk profile.
The compound was first described as a hypnotic agent by Yandell in 1888 under the name amylene hydrate.[3] It saw limited medical use as a sedative and as a solvent in the rectal anesthetic Avertin during the 1930s before fading from clinical practice. 2M2B re-emerged on internet drug forums in the late 2000s, marketed as a cheap, hangover-free alternative to alcohol — particularly among Eastern European substance-dependent populations.[4]
Subjective effects include sedation, anxiolysis, euphoria, motor control loss, and cognitive suppression. The experience resembles a prolonged, intensified alcohol intoxication with a subjectively cleaner character that users attribute to the absence of acetaldehyde — the toxic metabolite responsible for hangover.[5] Delirium, memory blackouts, and compulsive redosing are characteristic unsought effects at higher doses.
Physical dependence develops with repeated use, and respiratory depression is the primary life-threatening toxicity — published cases document respiratory failure requiring emergency intubation.[6] The margin between recreational intoxication and respiratory collapse has not been characterized, and the compound's undetectability on standard toxicology screens complicates emergency diagnosis. No clinical trials, controlled pharmacokinetic studies, or substance-specific binding data have been published — the evidence base consists entirely of case reports and in vitro work.
History[edit]
Discovery
The pharmacological properties of 2-methylbutan-2-ol were first described by D.W. Yandell in 1888, who characterized the compound under its pharmaceutical name amylene hydrate as a novel hypnotic.[3] The substance entered limited clinical use as a sedative between the 1880s and 1950s but never achieved wide adoption — chloroform, diethyl ether, and chloral hydrate already dominated the field.[7]
The Avertin era
During the 1930s, tert-amyl alcohol found its principal medical role as a solvent for tribromoethanol in Avertin, a rectal anesthetic marketed by Winthrop Laboratories.[7] The formulation was used to induce surgical anesthesia and persisted in rodent laboratory work through the mid-20th century, though human use was discontinued as safer agents emerged.[8]
Recreational re-emergence
2M2B resurfaced on internet drug forums in the late 2000s, initially concentrated in Eastern Europe — particularly Poland — where it was promoted among substance-dependent populations as a cheap, hangover-free, and toxicologically undetectable substitute for alcohol.[4] The first published case of acute intoxication appeared in 2014, documenting respiratory failure requiring emergency intubation.[6] Subsequent reports through 2024 documented growing emergency presentations, clinical withdrawal management, and at least one field intubation.[1][9][10]
The designation 2M2B became standard on English-language platforms including Reddit, Erowid, and Drugs-Forum, replacing the older pharmaceutical name amylene hydrate.[11][1] In Eastern European markets, the compound was sold under the street name "Vodka," typically in 5 or 10 mL unit doses — packaging that reinforced the marketing pitch of a cleaner, more potent substitute for alcohol.[4]
Chemistry[edit]
Structural class
2M2B belongs to the tertiary aliphatic alcohols — compounds in which a hydroxyl group is bonded to a carbon bearing three alkyl substituents and no hydrogen at the carbinol position. This structural feature has direct pharmacological consequences: without a C–H bond at the hydroxyl-bearing carbon, the compound cannot serve as a substrate for alcohol dehydrogenase, the enzyme that converts ethanol to acetaldehyde.
The parent scaffold is a five-carbon branched alcohol with two methyl groups and one ethyl group on the carbinol carbon. Structurally, 2M2B is one carbon larger than tert-butanol, a relationship that increases fat solubility and brain penetration.
Molecular properties
| Molecular formula | C₅H₁₂O |
| Molecular weight | 88.15 g/mol |
The molecule contains no chirality centers; stereochemistry is not relevant to its activity.
Physical properties
2M2B is a colorless liquid with an unpleasant odor and a burning taste.[8]
| Boiling point | 101–103 °C |
| Melting point | −9 °C |
| Density | 0.805 g/cm³ (25 °C) |
| Water solubility | 120 g/L |
| Flash point | 19 °C (flammable) |
The low flash point (19 °C) classifies 2M2B as a flammable liquid — a consideration for bulk storage.[8]
Synthesis and natural occurrence
Industrial production proceeds by acid-catalyzed hydration of 2-methyl-2-butene; a laboratory alternative uses the Favorskii reaction between acetone and acetylene followed by catalytic hydrogenation.[8]
Trace quantities occur naturally as fermentation byproducts in alcoholic beverages and have been detected in fried bacon, cassava, and rooibos tea. The compound also appears in rabbit milk, where it functions as a pheromone that triggers suckling behavior in newborns.[8]
Pharmacology[edit]
Mechanism of action
2M2B produces depressant effects through two complementary mechanisms: it enhances inhibitory signaling at GABA-A receptors and suppresses excitatory signaling at NMDA glutamate receptors. No substance-specific binding data have been published — mechanistic understanding rests on class-level evidence from ethanol and related aliphatic alcohols. inferred
At GABA-A receptors, 2M2B acts as a positive allosteric modulator, increasing chloride ion flow in response to GABA — the same general mechanism shared by ethanol, benzodiazepines, and barbiturates, though each class binds at a distinct site on the receptor.[12] This enhanced inhibition underlies the sedation, anxiolysis, and motor impairment characteristic of the compound.
At NMDA receptors, 2M2B acts as a non-competitive antagonist, reducing excitatory neurotransmission. Among aliphatic alcohols, potency for NMDA inhibition correlates directly with intoxicating potency[2] — strongly implying that 2M2B exerts substantially greater NMDA blockade than ethanol at equivalent intoxicating doses. The inhibition is voltage-independent and does not involve competition with glutamate or glycine at their binding sites.[13][14]
This dual mechanism — enhanced inhibition plus suppressed excitation — produces greater cognitive impairment and sedation than either action alone, and accounts for the compound's disproportionate potency relative to ethanol.
Pharmacokinetics
2M2B is rapidly absorbed after oral ingestion. Data from the structurally related compound TAME — of which 2M2B is a primary metabolite — indicate that first-pass liver metabolism does not significantly reduce the amount reaching systemic circulation.[15]
Unlike ethanol, 2M2B cannot be broken down by alcohol dehydrogenase. Metabolism proceeds entirely through cytochrome P450 enzymes in the liver.[5][16] The resulting metabolites — primarily 2-methyl-2,3-butanediol and related compounds — are far less toxic than acetaldehyde, accounting for the reduced hangover that users consistently report.[5]
Elimination is slow. Urinary metabolite half-lives range from 6 to 40 hours in humans, substantially longer than in rats.[17][15] This extended clearance is consistent with the prolonged intoxication documented in clinical case reports — 8 to 14 hours at typical doses, with higher doses extending effects beyond 24 hours.
Neuroscience[edit]
Where it acts
Enhanced GABA-A activity in the cerebral cortex reduces neural excitability, accounting for the cognitive suppression and decision impairment reported by users. In the amygdala, the same inhibition dampens fear-response circuits, producing anxiolysis. Cerebellar disruption underlies the characteristic loss of coordination documented in all clinical cases.[1][6]
At the brainstem, GABAergic modulation of respiratory control centers produces dose-dependent respiratory depression — the primary lethal risk. NMDA antagonism in the hippocampus impairs the cellular basis of memory formation, directly producing the blackouts reported at moderate-to-high doses.[2]
Tolerance and neuroadaptation
Chronic exposure triggers compensatory changes: GABA-A receptors are downregulated while NMDA receptors are upregulated, creating a state of latent neural hyperexcitability masked by the drug's continued presence.[12] When the drug is abruptly removed, this hyperexcitability becomes unmasked — the neurobiological basis of withdrawal seizures, tremor, anxiety, and delirium.[18][19]
Like ethanol, 2M2B is expected to activate reward circuitry indirectly: GABAergic inhibition in the ventral tegmental area disinhibits dopamine neurons, increasing dopamine release in the nucleus accumbens and driving the euphoria and reinforcement that sustain compulsive use.[9]
No neuroimaging or EEG studies have been conducted with 2M2B. Whether the 20-fold potency difference produces different GABA-A receptor adaptations than ethanol, whether the absence of acetaldehyde alters chronic brain toxicity, and what the precise dose-response curve for respiratory depression looks like all remain entirely uncharacterized. inferred
Subjective Effects[edit]
2M2B produces a depressant intoxication qualitatively similar to alcohol but distinguished by greater sedative depth and a subjectively cleaner cognitive character — attributed to the absence of acetaldehyde metabolites. The experience is heavily dose-dependent: the difference between sociable warmth with anxiolysis and incapacitating stupor spans only a few milliliters. Set and setting modulate the anxiolytic and social components but cannot override the pharmacological sedation and motor impairment.
Among GABAergic depressants, 2M2B sits between ethanol and GHB — more sedating and longer-lasting than ethanol, less sedating and with a wider dose-response margin than GHB.[20] The experience most closely resembles a prolonged, intensified version of alcohol intoxication without the hangover, though the narrow dose-volume margin introduces a qualitatively different risk profile.
Effect Grid
At 5–10 mL, 2M2B produces clear depressant intoxication. Sedation becomes the dominant experience — a heavy, enveloping relaxation accompanied by cognitive euphoria, pronounced anxiety suppression, and disinhibition. Thought deceleration and analysis suppression are noticeable: complex reasoning slows, and conversation becomes looser and more tangential. Memory suppression begins, particularly for new information formed during intoxication.
Motor control impairment is moderate: gait becomes unsteady, fine coordination deteriorates, and reaction time slows. Muscle relaxation deepens. Dizziness may occur, particularly when standing. Users report tactile euphoria and a pleasant bodily warmth. Pain suppression is present but mild.
Effects persist for 8–14 hours at typical doses within this range. The prolonged duration distinguishes 2M2B from ethanol intoxication of similar subjective intensity, which resolves in 3–6 hours. Functional impairment continues well beyond peak subjective effects.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Vestibular distortion · Visual acuity suppression · Visual haze / noise · Light sensitivity · Peripheral vision distortion · Auditory distortion · Auditory suppression · Sound sensitivity · Tinnitus · Visual processing suppression
Peripheral vision distortion · Auditory distortion · Auditory suppression · Sound sensitivity · Tinnitus · Visual processing suppression
Body high · Physical fatigue · Tactile euphoria · Pain suppression · Bodily heaviness · Nausea · Nystagmus (eye wobbles) · Breathing alteration · Headache · Increased urination · Body schema distortion · Dehydration sensation · Dry mouth · Insomnia · Laughter fits · Sexual arousal suppression · Vomiting · Appetite enhancement · Respiratory depression · Excessive sweating · Heart rate perception changes · Involuntary body movements · Trembling · Bodily dissociation
Pain suppression · Bodily heaviness · Nausea · Nystagmus (eye wobbles) · Breathing alteration · Headache · Increased urination · Body schema distortion · Dehydration sensation · Dry mouth · Insomnia · Laughter fits · Sexual arousal suppression · Vomiting · Appetite enhancement · Excessive sweating · Heart rate perception changes · Involuntary body movements · Trembling · Bodily dissociation
Analysis suppression · Cognitive impairment · Cognitive euphoria · Language suppression · Information processing suppression · Cognitive fatigue · Confusion · Delusions of sobriety · Memory fragmentation · Motivation suppression · Pattern recognition suppression · Suggestibility enhancement · Thought disorganization · Humor enhancement · Cognitive dysphoria · Amnesia · Delirium
Language suppression · Information processing suppression · Cognitive fatigue · Confusion · Memory fragmentation · Motivation suppression · Pattern recognition suppression · Suggestibility enhancement · Thought disorganization · Humor enhancement · Cognitive dysphoria · Amnesia · Delirium
Emotional suppression · Anxiety · Dysphoria · Irritability
Social connection · Craving · Ego inflation · Sociability suppression · Trust enhancement · Communication enhancement · Depersonalization · Derealization · Cognitive disconnection
Trust enhancement · Communication enhancement · Depersonalization · Derealization · Cognitive disconnection
Timeline
Absorption begins within minutes of ingestion. A subtle warmth and slight relaxation emerge, signaling the start of GABAergic activity. Effects are sub-threshold for most users at this stage.
Sedation and anxiolysis build progressively. Motor effects begin appearing — slight unsteadiness, softened coordination. Cognitive euphoria and warmth become clearly perceptible.
Full intoxication — sedation, euphoria, motor impairment, and cognitive suppression reach maximum intensity. Anxiolysis and disinhibition are pronounced. Memory suppression is active.
Sedation and euphoria gradually diminish. Motor coordination slowly returns, though cognitive effects — particularly memory and concentration — lag behind subjective improvement. Extended metabolite half-life (6–40 hours) prolongs this phase.
Residual cognitive blunting and mild fatigue. Hangover effects are minimal compared to ethanol — users report feeling relatively clear, though subtle concentration deficits may persist.
⚠ Do not drive or operate heavy machinery for at least 24 hours after ingestion; cognitive impairment may persist beyond subjective resolution of intoxication.
Safety[edit]
- Acute toxicity
- High
- Chronic toxicity
- Moderate
- Withdrawal
- Severefatal risk
- Tolerance buildup
- moderate
- Tolerance reset
- 10 days
- Physical
- Moderate
- Psychological
- Moderate
- Compulsive redosing
- Moderate
- Dose escalation
- Moderate
- Cross-tol.
- ethanol · benzodiazepines · barbiturates
Toxicity
Acute toxicity
No controlled human toxicity data exist for 2M2B. The rat oral lethal dose is approximately 1 g/kg body weight,[8]safety citation needed and community sources report 30 mL as the lowest fatal human dose[8] safety citation needed — unverified in peer-reviewed literature.
Respiratory failure is the primary life-threatening acute risk. Two published cases document respiratory arrest requiring emergency intubation.[6][10]
Metabolic effects
Ingestion of 20–25 mL produced elevated blood acidity (anion gap 26 mEq/L), elevated blood osmolality (311 mOsm/kg), elevated ketones (4 mmol/L), and mildly elevated liver enzymes in one documented case.[1] The pattern resembles toxic alcohol poisoning, though whether this reflects direct toxicity or secondary effects of prolonged fasting during intoxication has not been determined.
In vitro cytotoxicity
In laboratory cell studies, 2M2B is comparably toxic to ethanol and significantly less toxic than its structural isomer 3-methyl-1-butanol.[4]
Chronic toxicity
No human data on chronic toxicity exist. Rat studies of a related compound that metabolizes to 2M2B showed elevated liver toxicity markers and significant enzyme induction,[15] suggesting liver stress with chronic exposure.
Psychological risks
Higher doses produce confusion, disorientation, and delirium — documented at doses of 20–25 mL.[1] Memory blackouts are consistent with the glutamate-blocking mechanism and are reported in both clinical and community sources.
Cognitive impairment can persist for days. In one documented case, slurred speech, memory problems, and concentration deficits lasted 3 days after a single dose.[1] Chronic use is associated with low mood and reduced cognitive function.[9]
The prolonged duration extends the window of impaired judgment far beyond that of alcohol. Compulsive redosing is reported in community sources, and at least one case of clinical addiction requiring medical withdrawal management has been documented.[9]
Tolerance and dependence
Tolerance develops with repeated use, as expected for all drugs that activate GABA receptors. Community estimates place tolerance half-life at approximately 5 days and full reset at 1.5 weeks;[20]citation needed no peer-reviewed tolerance data exist.
Cross-tolerance with other GABA-activating drugs — benzodiazepines, barbiturates, and other alcohols — means individuals with existing tolerance require higher doses for effect while remaining at full risk for respiratory depression.[12]
Physical dependence develops with chronic use. Withdrawal produces tremor, anxiety, insomnia, sweating, seizures, and potentially delirium.[18][19] Clinical withdrawal management for 2M2B dependence has been documented in at least one published case.[9]
Drug Interactions
All interaction data are inferred from ethanol pharmacology. No substance-specific interaction studies have been published. inferred
The most dangerous combinations involve other central nervous system depressants. Taking 2M2B with opioids, benzodiazepines, barbiturates, alcohol, or GHB compounds respiratory depression — each substance suppresses breathing independently, and the effects add.[12] Published cases note that 2M2B users frequently combine the compound with other depressants.[1][6]
Drugs that slow the liver enzymes that break down 2M2B — including disulfiram — prolong and intensify intoxication.[5][15] The elimination half-life already spans 6–40 hours; further slowing clearance can extend intoxication to dangerous durations.
Gabapentinoids (gabapentin, pregabalin) add to the sedative and respiratory-depressant burden through a separate mechanism.
Contraindications
6 knownNo substance-specific contraindication studies exist. The following are inferred from the GABA-activating and glutamate-blocking mechanism class. inferred
Absolute:
- Compromised breathing or airway — 2M2B causes dose-dependent respiratory depression. Published cases document respiratory failure requiring intubation.[6][10]
- Concurrent use of other depressants — combining with opioids, benzodiazepines, barbiturates, alcohol, or GHB is potentially lethal.
Relative:
- Liver impairment — 2M2B is cleared entirely by the liver; impaired function prolongs exposure and increases toxicity.
- Seizure history — even acute use followed by clearance can lower seizure threshold in predisposed individuals.
- History of alcohol or sedative dependence — cross-tolerance drives dose escalation while respiratory depression risk remains. Undetectability on standard screens enables concealed relapse.
- Pregnancy — no reproductive toxicity data exist; teratogenic effects are presumed by analogy with ethanol. safety citation needed
Harm Reduction[edit]
Forms & Identification
2M2B is sold as a neat liquid, commonly in 5 or 10 mL units. It is an industrial solvent available through chemical suppliers, so purity cannot be verified without analytical testing. The burning taste and unpleasant odor are characteristic but cannot confirm identity or rule out contamination with more dangerous solvents.
Guidelines
- Measure volumetrically with a syringe or graduated pipette — the difference between a moderate and dangerous dose is measured in single milliliters. Do not eyeball, sip from the bottle, or estimate by capful.
- Start with the lowest effective dose and do not redose — effects can take over an hour to peak and last 8–14 hours. Additional doses compound risk with no clear ceiling.
- Have a sober companion present who is aware of the substance, dose, and timing.
- Eat a meal beforehand — an empty stomach increases absorption speed and the risk of metabolic disruption.
- Do not drive or operate machinery for at least 24 hours after ingestion.
Set & Setting
The prolonged duration requires more planning than a typical alcohol session. Clear obligations for the full following day. The compound produces substantial motor impairment — a safe, comfortable indoor environment is strongly advisable. A sober companion who knows what has been taken, how much, and when is essential, not optional.
Aftercare & integration. The extended intoxication can leave users cognitively impaired for a day or more after effects subside. Concentration difficulty, slurred speech, and memory gaps have persisted for up to 3 days in documented cases.
Prioritize hydration, adequate food intake, and sleep in the 48 hours following use. Do not operate vehicles or make important decisions until full cognitive clarity has returned. Significant memory gaps during the experience signal that the dose exceeded a safe range.
Recovery & Support
2M2B dependence follows the same pattern as alcohol dependence and carries the same withdrawal risks — including seizures and delirium. Do not attempt to stop heavy or daily use abruptly without medical supervision. Medical detoxification using a supervised benzodiazepine taper is the standard approach for GABAergic withdrawal.
Because 2M2B is undetectable on standard drug screens, standard monitoring programs will not detect relapse. Open communication with treatment providers about the specific substance is essential. Support resources include SAMHSA's National Helpline (1-800-662-4357), local addiction medicine services, and mutual aid groups. Treatment programs for alcohol use disorder are directly applicable.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency:
- Breathing becomes very slow, shallow, irregular, or stops
- Blue or grey discoloration of lips and fingertips
- Complete unresponsiveness — the person cannot be woken by voice or firm shoulder pressure
- Seizures
- Vomiting while unconscious
Immediate steps:
- 1. Call emergency services immediately if any of the above signs appear.
- 2. Place the person in the recovery position (on their side) to prevent choking on vomit.
- 3. Monitor breathing continuously. If breathing stops, begin rescue breathing or CPR if trained.
- 4. Do NOT induce vomiting.
- 5. Do NOT leave the person alone.
What to tell the dispatcher:
State the substance (2-methyl-2-butanol / 2M2B / tert-amyl alcohol), the estimated amount consumed, when it was taken, and current symptoms. Note that 2M2B does not appear on standard toxicology screens — the dispatcher and receiving team need the specific substance name. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
Legal Status[edit]
2M2B is primarily regulated as an industrial solvent rather than a controlled substance — its legal status varies widely by jurisdiction.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States | Unscheduled | Not listed in DEA Controlled Substances schedules. Available as an industrial solvent and laboratory reagent without restriction. The Federal Analogue Act may theoretically apply if sold for human consumption, though no enforcement action has been documented. |
| United Kingdom | Controlled (Psychoactive Substances Act 2016) | Covered under the blanket ban on psychoactive substances effective 26 May 2016. Production, supply, and import for human consumption are prohibited. Personal possession is not an offence under the PSA.[20] |
| Germany | Prescription medicine | Listed as "Amylenhydrat" under Anlage 1 AMVV. Requires a prescription for pharmaceutical use.citation needed |
| European Union (general) | Unscheduled as NPS | Listed on the ECHA substances register as an industrial chemical under REACH regulations. No EU-wide psychoactive substance scheduling identified. Individual member states may have additional controls. |
| Australia | Unclear | No confirmed scheduling under the Poisons Standard. Community claims regarding analogue act applicability have not been resolved by regulatory documentation.citation needed |
| Canada | Unclear | No specific scheduling identified under the Controlled Drugs and Substances Act. Status under analogue provisions has not been tested.citation needed |
Safety[edit]
- Acute toxicity
- High
- Chronic toxicity
- Moderate
- Withdrawal
- Severefatal risk
- Tolerance buildup
- moderate
- Tolerance reset
- 10 days
- Physical
- Moderate
- Psychological
- Moderate
- Compulsive redosing
- Moderate
- Dose escalation
- Moderate
- Cross-tol.
- ethanol · benzodiazepines · barbiturates
Toxicity
Acute toxicity
No controlled human toxicity data exist for 2M2B. The rat oral LD₅₀ is approximately 1 g/kg body weight.[8]safety citation needed The lowest reported fatal dose in humans is 30 mL in community sources;[8]safety citation needed this figure has not been verified in peer-reviewed literature.
Respiratory failure is the primary life-threatening acute toxicity. Two published cases document respiratory arrest requiring emergency intubation.[6][10]
Metabolic effects
Ingestion of 20–25 mL produced elevated anion gap (26 mEq/L), elevated blood osmolality (311 mOsm/kg), elevated ketone bodies (4 mmol/L), and mildly elevated liver enzymes in one documented case.[1] The pattern resembles toxic alcohol poisoning, though whether the metabolic disruption represents direct toxicity or secondary effects from prolonged fasting during intoxication has not been determined.
In vitro cytotoxicity
In laboratory cell studies, 2M2B cytotoxicity is comparable to ethanol and significantly lower than its isomer 3-methyl-1-butanol.[4] At higher concentrations, the compound induces cell death in retinal cancer cells through a specific growth-signaling pathway, with dose-dependent toxicity to normal cells.[21]
Chronic toxicity
No human data on chronic toxicity have been published. Rat studies of a structurally related compound metabolized to 2M2B showed elevated liver toxicity markers and significant liver enzyme induction (up to 260-fold),[16] suggesting liver stress with chronic exposure.
Psychological risks
Higher doses produce delirium, confusion, and disorientation — documented at doses of 20–25 mL.[1] Memory blackouts during intoxication are consistent with the NMDA antagonist mechanism and reported in both clinical and community sources.
Cognitive impairment may persist for days after significant exposure. In one case, slurred speech, memory problems, and concentration deficits lasted 3 days following a single dose.[1] Chronic use has been associated with low mood and reduced cognitive functioning.[9]
The prolonged duration extends the window of impaired judgment and disinhibition far beyond that of alcohol. Compulsive redosing is reported in community sources, and at least one case of clinical addiction requiring medical withdrawal management has been documented.[9]
Tolerance and dependence
Tolerance develops with repeated use, as expected for all GABA-A positive allosteric modulators. Community estimates place tolerance half-life at approximately 5 days and full reset at 1.5 weeks;[20]citation needed no peer-reviewed tolerance data exist.
Cross-tolerance with other GABAergic drugs — including benzodiazepines, barbiturates, and other alcohols — is established at the class level.[12] Individuals with existing alcohol or benzodiazepine tolerance require higher doses for effect while remaining at full risk for respiratory depression.
Physical dependence develops with chronic use. Withdrawal is expected to produce a syndrome similar to alcohol or benzodiazepine withdrawal: tremor, anxiety, insomnia, sweating, seizures, and potentially delirium tremens.[18][19] The first published case of clinical withdrawal management for 2M2B addiction confirmed that dependence severe enough to require medical detoxification occurs in human users.[9]
Drug Interactions
All interaction data are inferred from ethanol pharmacology. No substance-specific interaction studies have been published. inferred
The most dangerous combinations involve other central nervous system depressants. Co-administration with opioids, benzodiazepines, barbiturates, ethanol, or GHB produces compounding respiratory depression through convergent mechanisms.[12] Published case reports note that 2M2B users are frequently polysubstance-dependent individuals who combine the compound with other depressants,[1][6] making these interactions clinically relevant.
Drugs that inhibit CYP2E1 — including disulfiram — may slow the breakdown of 2M2B, prolonging and intensifying intoxication.[5][16] Because elimination half-life already spans 6–40 hours, further impairment of clearance could extend intoxication to dangerous durations.
Gabapentinoids (gabapentin, pregabalin) add to the sedative and respiratory-depressant burden through a separate mechanism.
Contraindications
6 knownNo substance-specific contraindication studies exist. The following are inferred from the GABA-A PAM and NMDA antagonist mechanism class. inferred
Absolute:
- Compromised breathing or airway — 2M2B causes dose-dependent respiratory depression. Published cases document respiratory failure requiring intubation.[6][10]
- Concurrent use of other depressants — compounding respiratory depression with opioids, benzodiazepines, barbiturates, ethanol, or GHB is potentially lethal.
Relative:
- Liver impairment — 2M2B is cleared entirely by the liver. Impaired function would prolong exposure and increase toxicity.
- Seizure history — GABAergic withdrawal lowers seizure threshold; even acute use followed by clearance could provoke seizures in predisposed individuals.
- History of alcohol or sedative dependence — cross-tolerance encourages dose escalation while respiratory depression risk remains. Undetectability on standard screens enables concealed relapse.
- Pregnancy — no reproductive toxicity data exist. Teratogenic effects are presumed by analogy with ethanol. safety citation needed
Harm Reduction[edit]
Forms & Identification
2M2B is typically sold as a neat liquid in small volumes — commonly 5 or 10 mL units. Because it is an industrial solvent available through chemical suppliers, purity claims from vendors cannot be independently verified without analytical testing. The burning taste and unpleasant odor are characteristic, but these properties alone cannot confirm identity or rule out contamination with more dangerous solvents.
Guidelines
- Measure volumetrically with a syringe or graduated pipette — the difference between a moderate and dangerous dose is measured in single milliliters. Eyeballing, sipping from the bottle, or estimating by capful creates unacceptable imprecision.
- Start with the lowest effective dose and do not redose — effects can take over an hour to peak and last 8–14 hours. Additional doses compound risk with no clear ceiling.
- Have a sober companion present who is aware of the substance, dose, and timing.
- Eat a meal beforehand — an empty stomach increases absorption speed and the risk of metabolic disruption.
- Do not drive or operate machinery for at least 24 hours after ingestion.
Set & Setting
The prolonged duration of 2M2B intoxication requires more planning than a typical alcohol session. Ensure obligations are cleared for the full following day. The compound produces substantial motor impairment; a safe, comfortable indoor environment with no need to travel is strongly advisable. A sober companion who knows what has been taken, how much, and when is essential — not optional.
Aftercare & integration. The extended duration of 2M2B intoxication can leave users cognitively impaired for a day or more after the primary effects subside. Concentration difficulty, slurred speech, and memory gaps have persisted for up to 3 days in documented cases.
Prioritize hydration, adequate food intake, and sleep in the 48 hours following use. Avoid operating vehicles or making important decisions until full cognitive clarity has returned. Significant memory gaps during the experience signal that the dose exceeded a safe range.
Recovery & Support
2M2B dependence follows the same pattern as alcohol dependence and carries the same withdrawal risks — including seizures and delirium. Do not attempt to stop heavy or daily use abruptly without medical supervision. Medical detoxification using a supervised benzodiazepine taper is the standard approach for GABAergic withdrawal.
Because 2M2B is undetectable on standard drug screens, individuals in recovery face an additional challenge: standard monitoring programs will not detect relapse. Open communication with treatment providers about the specific substance is essential. Support resources include SAMHSA's National Helpline (1-800-662-4357), local addiction medicine services, and mutual aid groups. Treatment programs for alcohol use disorder are directly applicable.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency:
- Breathing becomes very slow, shallow, irregular, or stops
- Blue or grey discoloration of lips and fingertips
- Complete unresponsiveness — the person cannot be woken by voice or firm shoulder pressure
- Seizures
- Vomiting while unconscious
Immediate steps:
- 1. Call emergency services immediately if any of the above signs appear.
- 2. Place the person in the recovery position (on their side) to prevent choking on vomit.
- 3. Monitor breathing continuously. If breathing stops, begin rescue breathing or CPR if trained.
- 4. Do NOT induce vomiting.
- 5. Do NOT leave the person alone.
What to tell the dispatcher:
State the substance (2-methyl-2-butanol / 2M2B / tert-amyl alcohol), the estimated amount consumed, when it was taken, and current symptoms. Note that 2M2B does not appear on standard toxicology screens — the dispatcher and receiving team need the specific substance name. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
Legal Status[edit]
2M2B occupies an ambiguous legal position in most jurisdictions. It is primarily regulated as an industrial solvent and chemical reagent rather than as a controlled substance. No international drug treaty includes 2M2B — neither the UN Single Convention on Narcotic Drugs (1961) nor the Convention on Psychotropic Substances (1971). Where specific regulation exists, it derives from blanket psychoactive substance legislation or pharmaceutical scheduling rather than controlled substance scheduling.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States | Unscheduled | Not listed in DEA Controlled Substances schedules. Available as an industrial solvent and laboratory reagent without restriction. The Federal Analogue Act may theoretically apply if sold for human consumption, though no enforcement action has been documented. |
| United Kingdom | Controlled (Psychoactive Substances Act 2016) | Covered under the blanket ban on psychoactive substances effective 26 May 2016. Production, supply, and import for human consumption are prohibited. Personal possession is not an offence under the PSA.[20] |
| Germany | Prescription medicine | Listed as "Amylenhydrat" under Anlage 1 AMVV. Requires a prescription for pharmaceutical use.citation needed |
| European Union (general) | Unscheduled as NPS | Listed on the ECHA substances register as an industrial chemical under REACH regulations. No EU-wide psychoactive substance scheduling identified. Individual member states may have additional controls. |
| Australia | Unclear | No confirmed scheduling under the Poisons Standard. Community claims regarding analogue act applicability have not been resolved by regulatory documentation.citation needed |
| Canada | Unclear | No specific scheduling identified under the Controlled Drugs and Substances Act. Status under analogue provisions has not been tested.citation needed |
Frequently asked questions
What is 2M2B?
2M2B is a tertiary alcohol depressant and GABA-A positive allosteric modulator approximately 20 times more potent than ethanol by weight. First used as a hypnotic in 1888, it re-emerged as a recreational substance in the late 2000s; no controlled human studies have been published.
How long does 2M2B last?
Total duration by route of administration — Oral: 8 – 14 hours. Ranges vary with dose and individual factors; see the duration table for onset, peak, and after-effect phases.
Where can I find dosage information for 2M2B?
Psychedex publishes a dosage table for 2M2B on this page covering these routes of administration: oral. Dose values are presented only in that table, always alongside their route of administration.
What are dangerous combinations with 2M2B?
The highest-severity documented interactions for 2M2B: GHB, GBL (Lethal), Opioids (Lethal), Alpha-2 adrenergic receptor antagonist (Dangerous), Anticholinergics (Dangerous), Antihistamines (Dangerous). See the interactions section for the full list with mechanisms and severity levels.
Is 2M2B addictive?
Psychedex records tolerance and dependence data rather than a yes/no rating. Recorded tolerance indicators for 2M2B: tolerance builds moderate; full reset takes 10 days; cross-tolerance develops with ethanol, benzodiazepines, barbiturates, neurosteroids, other GABA-A PAMs. See the article's dependence and safety sections for recorded dependence data.
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First-person accounts of subjective effects, timing, and outcomes — submitted for harm reduction.
references
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- [4] ^abcdRusiecka I, Gagalo I, Anand JS, Schetz D, Waldman W (2016) Drinking 'Vodka' or vodka - This is a question — Toxicology in Vitro doi:10.1016/j.tiv.2016.07.009
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references
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- [2] ^abcLovinger DM, White G, Weight FF (1989) Ethanol inhibits NMDA-activated ion current in hippocampal neurons — Science PMID:2467382
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- [4] ^abcdRusiecka I, Gagalo I, Anand JS, Schetz D, Waldman W (2016) Drinking 'Vodka' or vodka - This is a question — Toxicology in Vitro doi:10.1016/j.tiv.2016.07.009
- [5] ^abcdAmberg A, Bernauer U, Scheutzow D, Dekant W (1999) Biotransformation of tert-Amyl Methyl Ether and tert-Amyl Alcohol — Chemical Research in Toxicology doi:10.1021/tx990078x
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