αMT
α-methyltryptamine
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αMT (alpha-methyltryptamine) — street name Spirals — is a synthetic psychedelic-stimulant of the tryptamine class. It sits pharmacologically between classical psychedelics and entactogens like MDMA. It releases serotonin, dopamine, and norepinephrine while activating serotonin receptors, producing a combined psychedelic-stimulant experience.[1][2]
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Synthesized in the early 1960s as an antidepressant candidate, αMT was marketed in the Soviet Union as Indopan — the only country where it reached clinical use.[3] It resurfaced in the late 1990s as a recreational research chemical, and the first documented US death in 2003 triggered permanent Schedule I placement.[4] αMT is now controlled in the United States, United Kingdom, and most Western jurisdictions, with no medical development programme.
Subjective effects include geometric visual patterns, color enhancement, thought acceleration, euphoria, wakefulness, and emotional warmth. The experience layers psychedelic perception over a stimulant-empathogenic baseline — more physically activating and emotionally open than classical tryptamines, with an unusually long duration. Nausea during onset, jaw tension, and a stimulant-type comedown with low mood and fatigue are characteristic unsought effects.
αMT does not produce physical dependence, and close analogs show low reinforcement potential.[5] The primary risk is serotonin overload: αMT inhibits the enzyme that clears serotonin while simultaneously flooding the brain with it, creating dangerous accumulation even without other drugs.[6][7] No controlled human studies exist; the evidence rests on animal pharmacology, forensic case reports, and user accounts.
History[edit]
Discovery
αMT was synthesized in the early 1960s by Upjohn Pharmaceuticals and Sandoz, both pursuing it as a monoamine oxidase inhibitor antidepressant.[3][8] It advanced to clinical use in the Soviet Union as Indopan, sold in 5 mg and 10 mg oral tablets for depression.[3] Indopan was eventually withdrawn due to serious adverse effects, the details of which are poorly documented in English.citation needed
Recreational emergence and scheduling
αMT resurfaced in the late 1990s via internet vendors as a legal psychedelic alternative.[9][10] The first documented US fatality occurred in February 2003 in Florida,[11] triggering emergency DEA scheduling in April and permanent Schedule I placement in September 2004.[4][12] In the United Kingdom, αMT appeared in 2011 and was classified Class A effective January 7, 2015.[8]
Current status
Deaths and serious poisonings have been reported in the United States, United Kingdom, Sweden, Norway, and Japan.[13] No clinical trials have been registered and no development programme exists.
The name alpha-methyltryptamine describes the methyl group at the alpha position of the tryptamine side chain — the same modification that distinguishes amphetamine from phenethylamine. The brand name Indopan derives from the indole ring system. The DEA recorded "Spirals" as a street name, though αMT and AMT remain the dominant identifiers in online communities.[8]
Chemistry[edit]
Structural class
αMT belongs to the tryptamine family, sharing its indole ring system with DMT, psilocybin, and serotonin.[8] Its molecular formula is C₁₁H₁₄N₂ (174.24 g/mol), and its systematic name is 1-(1H-indol-3-yl)propan-2-amine.[3]
A methyl group at the alpha position of the side chain protects the molecule from enzymatic breakdown, giving αMT oral activity and its unusually long duration without a co-administered monoamine oxidase inhibitor.[8]
Pharmacology[edit]
Mechanism of action
The alpha-methyl group protects αMT from MAO-A — the enzyme that breaks down serotonin, dopamine, and norepinephrine in the brain.[3][6] This lets αMT survive oral ingestion without a co-administered monoamine oxidase inhibitor.[8] It also slows the clearance of the monoamines αMT releases, amplifying and extending its effects.
αMT floods the brain with serotonin, dopamine, and norepinephrine from nerve terminals[1] and directly activates the serotonin receptors that drive psychedelic perception.[9][14] In mice, blocking these serotonin receptors eliminates the hallucinogen-like behaviour entirely.[2]
Pharmacokinetics
No human pharmacokinetic study has been published. The prolonged 13–15 hour oral duration likely results from MAO protection combined with concurrent MAO-A inhibition slowing monoamine clearance. Nine metabolites have been identified in human liver cells,[15] but the responsible enzymes remain unknown.inferred
Neuroscience[edit]
Where it acts
αMT engages the same serotonin receptors as classical psychedelics — on neurons in the prefrontal cortex[2] — while simultaneously flooding the brain with dopamine and norepinephrine.[1] The dopamine release activates reward circuitry not typically engaged by classical psychedelics. The norepinephrine drives stimulant-like arousal and cardiovascular activation — which is why αMT feels like neither a pure psychedelic nor a pure stimulant.
Why it matters
Like classical psychedelics, αMT's serotonin receptor activation likely promotes new neural connections and structural changes in brain cells.inferred[5] The extended duration raises an open question: does sustained receptor engagement produce different brain changes than shorter-acting agents?
Key unresolved questions include whether αMT produces neuroplastic changes comparable to classical psychedelics, how simultaneous MAO-A inhibition and monoamine release modify the brain signature of psychedelic states, and whether the two mirror-image forms of αMT differ in brain effects as demonstrated for the close structural analog αET.[16]
Subjective Effects[edit]
αMT produces a hybrid experience: psychedelic imagery layered over stimulant energy and emotional warmth. The experience doesn't feel like a clean psychedelic or a clean stimulant — both dimensions are present simultaneously. The mind opens while the body buzzes with a persistent wakefulness.
The closest comparisons are MDA, which shares the psychedelic-stimulant-empathogenic blend through different mechanisms, and high-dose 2C-B, which pairs visual intensity with physical activation. αMT is markedly longer than either, and the comedown resembles post-amphetamine recovery rather than a gentle psychedelic fade.
Effect Grid
At common doses (25–40 mg oral), the full combined stimulant-psychedelic experience manifests. Visual effects become prominent: geometric patterning on surfaces, colour saturation and shifting, drifting and morphing of objects, and vivid closed-eye visuals. Music enhancement is marked. Time distortion becomes significant — hours may feel compressed or expanded. Thought connectivity increases dramatically, producing novel associations and conceptual thinking.
Stimulant effects are strong: sustained wakefulness, elevated mood approaching euphoria, and pronounced empathy. Cardiovascular activation is evident — increased heart rate, elevated blood pressure, and temperature dysregulation. Nausea at onset is common. Appetite is suppressed throughout.
The total experience spans 13–15 hours. Functional impairment is significant for the duration. Sleep is impossible for 10–12 hours post-ingestion.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Geometry · Symmetrical texture repetition · After-images · Auditory enhancement · Environmental patterning · Light sensitivity · Perspective distortion · Sound sensitivity · Visual breathing · Auditory distortion · Auditory misinterpretation · Brightness alteration · Depth perception distortion · Peripheral misidentification · Peripheral vision distortion · Proprioceptive distortion · Spatial disorientation · Touch enhancement · Vestibular distortion · Visual haze / noise · Visual morphing · Synesthesia · Visual diffraction · Visual melting · Flashbacks · Object transformations · Internal hallucinations · External hallucinations · Visual recursion · Visual scenery slicing · Auditory hallucinations · Environmental orbism / cubism · Object activation · Persisting hallucinations
Environmental patterning · Light sensitivity · Perspective distortion · Sound sensitivity · Visual breathing · Auditory distortion · Auditory misinterpretation · Brightness alteration · Depth perception distortion · Peripheral misidentification · Peripheral vision distortion · Proprioceptive distortion · Spatial disorientation · Touch enhancement · Vestibular distortion · Visual haze / noise · Visual morphing · Synesthesia · Visual diffraction · Visual melting · Flashbacks · Object transformations · Internal hallucinations · External hallucinations · Visual recursion · Visual scenery slicing · Auditory hallucinations · Environmental orbism / cubism · Object activation · Persisting hallucinations
Nausea · Body high · Insomnia · Restlessness · Spontaneous body sensations · Excessive sweating · Appetite suppression · Dry mouth · Heart rate perception changes · Muscle tension · Physical fatigue · Tingling / electric sensations · Vibrations / buzzing · Increased urination · Dehydration sensation · Headache · Bruxism · Dizziness · Vasoconstriction · Bodily lightness · Tactile euphoria · Trembling · Vomiting · Abnormal heartbeat
Restlessness · Spontaneous body sensations · Excessive sweating · Appetite suppression · Dry mouth · Heart rate perception changes · Muscle tension · Physical fatigue · Tingling / electric sensations · Vibrations / buzzing · Increased urination · Dehydration sensation · Headache · Bruxism · Dizziness · Bodily lightness · Tactile euphoria · Trembling · Vomiting · Abnormal heartbeat
Cognitive euphoria · Immersion enhancement · Conceptual thinking · Aesthetic enhancement · Cognitive fatigue · Cognitive flexibility · Introspection enhancement · Novelty enhancement · Openness enhancement · Analysis enhancement · Memory suppression · Cognitive impairment · Creativity enhancement · Increased nature relatedness · Multiple thought streams · Thought loops · Humor enhancement · Motivation enhancement · Compulsive redosing urge · Confusion · Memory fragmentation · Memory replays · Synchronicity · Thought disorganization · Focus enhancement
Aesthetic enhancement · Cognitive fatigue · Cognitive flexibility · Introspection enhancement · Novelty enhancement · Openness enhancement · Analysis enhancement · Memory suppression · Cognitive impairment · Creativity enhancement · Increased nature relatedness · Multiple thought streams · Thought loops · Humor enhancement · Motivation enhancement · Confusion · Memory fragmentation · Memory replays · Synchronicity · Thought disorganization · Focus enhancement
Anxiety · Emotional lability · Simultaneous emotions · Anhedonia · Catharsis · Dysphoria · Irritability
Catharsis · Dysphoria · Irritability
Social connection · Trust enhancement · Communication enhancement · Flow state · Craving · Depersonalization · Identity alteration · Boundary dissolution · Ego dissolution
Craving · Depersonalization · Identity alteration · Boundary dissolution · Ego dissolution
Entity contact · Non-dual awareness
Timeline
First alerts emerge gradually — mild mood shift, subtle sensory brightening, faint body awareness. The unusually slow onset (60–180 minutes) is a primary redosing risk factor; effects may not be perceptible for over an hour.
Stimulant and psychedelic effects build in tandem. Nausea and possible vomiting are common during this phase. Heart rate rises noticeably, mood elevation increases, and faint visual distortions begin to appear.
Full psychedelic-stimulant experience: pronounced visual patterning, colour enhancement, thought connectivity, music enhancement, and euphoria. Cardiovascular stimulation (tachycardia, hypertension) is sustained. The peak is notably long compared to other tryptamines, reflecting αMT's MAO-A inhibition prolonging serotonergic activity.
Psychedelic intensity diminishes while stimulant activation persists. Visual effects recede to subtle colour shifts and mild pattern recognition. Mental stimulation and wakefulness continue.
Gradual return toward baseline over several hours. Residual stimulation prevents sleep. Mood may shift toward fatigue and irritability as the stimulant component wanes.
Residual effects include low mood, physical fatigue, flu-like symptoms, and lingering insomnia lasting 1–2 days. Some users report mild cognitive fog and emotional flatness.
⚠ Do not drive or operate machinery until after a full night of sleep following the experience — residual stimulant impairment and sleep deprivation significantly compromise reaction time and judgement.
Safety[edit]
- Acute toxicity
- Moderate
- Chronic toxicity
- Low
- Withdrawal
- None
- Tolerance buildup
- rapid
- Tolerance reset
- 30 days
- Physical
- None
- Psychological
- Low
- Compulsive redosing
- Low
- Dose escalation
- Negligible
- Cross-tol.
- psilo · LSD · DMT
Toxicity
Acute toxicity
No formal lethal dose has been established in any species.[2] Two documented fatalities provide reference points: postmortem blood concentrations of 2.0 mg/L in the first US death[11] and 4.69 mg/L alongside multiple other substances in a later case.[17] The polydrug context prevents establishing a reliable lethal threshold.safety citation needed
αMT cross-reacts with amphetamine immunoassays,[11] so hospital drug tests may return a false positive for amphetamine.
Serotonin toxicity
αMT can trigger dangerous serotonin overload — altered mental state, muscle rigidity, dangerously high body temperature, rapid heart rate, and profuse sweating — even without other drugs present.[7][8] This happens because αMT both floods the brain with serotonin and simultaneously blocks the enzyme that clears it.[6]
Heart and circulation
Rapid heart rate, high blood pressure, agitation, and confusion are documented in clinical toxicity reports.[18] Muscle breakdown has been documented in cases and can lead to kidney damage.[8]
Psychological risks
Acute anxiety, panic attacks, and paranoia are documented in clinical case series.[18] The 13–15 hour duration amplifies distress — an adverse experience cannot be waited out quickly, and stimulant-driven insomnia compounds exhaustion.
A stimulant-type comedown with low mood and flu-like symptoms lasting 1–2 days is consistently reported.[8] Persistent perceptual disturbances have not been formally studied but are plausible given αMT's mechanism.inferred Those with personal or family history of psychotic disorders or bipolar disorder face elevated risk.inferred
Tolerance and dependence
Tolerance to psychedelic effects builds rapidly — a single dose induces tolerance within 24 hours via serotonin downregulation in the frontal cortex.[19] Community reports suggest full reset at roughly one month, though this is unconfirmed by αMT-specific studies.citation needed
Cross-tolerance with psilocybin, LSD, DMT, and mescaline is expected from shared serotonin receptor mechanisms.[19] A close structural analog showed no self-administration in mice, suggesting low dependence potential.[5]
Drug interactions
αMT is both a reversible MAO-A inhibitor and a serotonin releaser. Combination with any serotonergic substance carries serious serotonin syndrome risk.
Serotonergic combinations (life-threatening)
MDMA: Both agents cause massive serotonin release through different mechanisms. Combining them creates compounded accumulation with extreme serotonin syndrome risk.[6][7][20]
Tramadol: tramadol inhibits serotonin reuptake and has mild MAOI activity; combined with αMT's MAO-A inhibition this creates dangerous serotonin accumulation. Tramadol also lowers the seizure threshold.[20]
Dextromethorphan (DXM): DXM inhibits serotonin reuptake and has weak MAOI activity. Combined with αMT this creates serotonin syndrome risk.[20]
SSRIs and SNRIs: Any serotonin reuptake inhibitor combined with αMT's MAO-A inhibition and serotonin release creates dangerous serotonin accumulation.[20]
Stimulant combinations
Cocaine: cocaine blocks dopamine and norepinephrine reuptake; combined with αMT's monoamine release this creates cardiovascular toxicity risk — dangerously high blood pressure, irregular heartbeat — and elevated body temperature.[20]
Other high-risk combinations
PCP, methoxetamine (MXE): Dissociatives combined with serotonergic agents may produce unpredictable behavioural toxicity.safety citation needed
Mescaline: Both compounds act on serotonin systems; combination increases serotonin receptor stimulation.safety citation needed
Contraindications
αMT is contraindicated in individuals taking serotonergic medications — SSRIs, SNRIs, MAOIs, lithium, triptans, tramadol.[20] The washout period for SSRIs before αMT exposure should account for at least five elimination half-lives of the SSRI.
Personal or family history of psychotic disorders or bipolar disorder is a relative contraindication.inferred Heart conditions — high blood pressure, irregular heartbeat, structural heart disease — are relative contraindications given documented cardiovascular toxicity.[18] Pregnancy and breastfeeding are absolute contraindications in the absence of reproductive toxicology data.safety citation needed
Harm Reduction[edit]
Forms & Identification
αMT circulates as powder, capsules, and pressed pellets or tablets.[21] Powder presents the highest dosing risk — small weighing errors produce large changes in effect intensity. A milligram-precision scale (0.001 g) is essential for powder forms.
αMT cross-reacts with amphetamine immunoassays,[11] so reagent testing is necessary to confirm identity rather than relying on presumptive field tests. Because αMT shares appearance with many other powdered tryptamines and phenethylamines, laboratory analysis provides the highest confidence.
Guidelines
- Test the substance with multiple reagent kits before use. Consider laboratory analysis for unknown powder.
- Use a milligram-precision scale (0.001 g) for powder forms. Never estimate doses by eye.
- Start with a low dose and do not redose early. The slow onset (up to 2–3 hours oral) can tempt premature redosing, which dramatically increases risk.
- Clear a full 24-hour window. Active effects last 13–15 hours; residual stimulation and insomnia extend beyond that.
- Stay hydrated and eat lightly before and during the experience. The stimulant component increases water and electrolyte loss.
- Have a sober sitter present who understands the substance's long duration and stimulant character.
- Avoid all serotonergic substances including supplements like 5-HTP, St John's Wort, and tryptophan in the days surrounding use.
Set & Setting
The extended duration makes environmental planning unusually important. An unstable setting that would be manageable over 4 hours becomes a serious source of distress over half a day. Secure a private, comfortable space for the full duration and clear all obligations for the day and the following morning.
A trusted, sober sitter is strongly recommended, particularly for first experiences or higher doses. The stimulant component means sleep will not be possible for many hours after ingestion — plan timing accordingly. Nausea during onset is near-universal; a light or empty stomach and anti-nausea remedies help.
Aftercare & integration. The stimulant comedown after αMT typically involves low mood, physical fatigue, and flu-like symptoms lasting 1–2 days.[8] Prioritise sleep, hydration, and light nutrition in the 24–48 hours following the experience. Avoid stimulants, including excess caffeine, during recovery.
The psychedelic component may surface emotionally significant material. Journaling, conversation with a trusted person, or work with an integration-trained therapist can help process the experience. If disturbing thoughts, persistent anxiety, or perceptual changes continue beyond a week, seek professional support.
Recovery & Support
αMT does not produce physical dependence, and compulsive use patterns have not been documented. Any pattern of repeated psychoactive use that interferes with daily functioning, relationships, or wellbeing warrants attention regardless of pharmacological dependence profile.
Harm reduction services, psychedelic integration circles, and substance use counsellors can provide non-judgmental support. SAMHSA's National Helpline (1-800-662-4357) offers free referrals in the United States. In the UK, FRANK (0300 123 6600) and Release (020 7324 2989) provide confidential advice.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognising an emergency:
Uncomfortable effects (nausea, anxiety, elevated heart rate) are common and do not themselves require medical intervention. Seek emergency help immediately if any of the following occur:
- Body temperature that is visibly or palpably dangerously high (hot, dry skin or profuse uncontrollable sweating)
- Severe muscle rigidity, tremor, or jerking movements (signs of serotonin syndrome)
- Seizure or loss of consciousness
- Chest pain or irregular heartbeat
- Extreme confusion, aggression, or complete disconnection from reality with self-harm risk
Immediate steps:
- 1. Call emergency services immediately if any of the above are present.
- 2. Move the person to a cool, quiet area. Remove excess clothing if body temperature is elevated.
- 3. If unconscious but breathing, place in the recovery position (on their side, airway clear).
- 4. Do not induce vomiting. Do not physically restrain unless there is immediate danger of self-harm.
- 5. Stay with the person until help arrives.
What to tell the dispatcher: State the substance (alpha-methyltryptamine / αMT), estimated amount if known, time of ingestion, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
Legal Status[edit]
Overview
αMT is controlled in multiple jurisdictions, scheduling driven primarily by recreational fatalities in the early 2000s.[13] No international UN convention scheduling has been enacted, though a WHO Expert Committee review has been conducted.
Legal status changes frequently and varies by jurisdiction. This information is not legal advice and may not reflect current law.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States | Schedule I (Controlled Substances Act) | Temporary placement April 4, 2003;[4] permanent September 29, 2004.[12] Triggered by first US fatality in February 2003.[11] |
| United Kingdom | Class A (Misuse of Drugs Act 1971) | Effective January 7, 2015, following ACMD recommendation.[8] Possession: up to 7 years imprisonment and/or unlimited fine. Supply: up to life imprisonment and/or unlimited fine. |
| Australia | Schedule 8 (controlled drug) | [13] |
| Germany | Controlled (Betäubungsmittelgesetz, BtMG) | [13] |
| Japan | Controlled substance | [13] |
| Canada | Not explicitly scheduled (as of 2025) | Not controlled under CDSA schedules. Status should be verified against current Health Canada scheduling.citation needed |
Analog act considerations
αMT's permanent Schedule I placement means the Federal Analogue Act does not apply to the parent compound in the United States. Novel αMT analogs not specifically scheduled could fall under the Analogue Act if sold for human consumption.
references
- [1] ^abcLi K, Li N, Chen Y, Li X, Qiao Y, Wang D, Di B, Xu P (2025) A systematic study of changes in monoamine neurotransmitters in the rat brain following acute administration of alpha-methyltryptamine (AMT), 5-methoxy-alpha-methyltryptamine (5-MeO-AMT) and 5-methoxy-N,N-diisopropyltryptamine (5-MeO-DiPT). — Neuroscience research doi:10.1016/j.neures.2025.04.006
- [2] ^abcdLi K, Li N, Chen Y, Li X, Qiao Y, Wang D, Di B, Xu P (2025) Effects of three tryptamines: alpha-methyltryptamine, 5-methoxy-alpha-methyltryptamine, and 5-methoxy-N,N-diisopropyltryptamine on acute toxicity, locomotor activity, and hallucinogenic behavior in mice. — Behavioural pharmacology doi:10.1097/fbp.0000000000000841
- [3]
- [4] ^abcDEA Deputy Administrator (2003) Schedules of controlled substances: temporary placement of alpha-methyltryptamine and 5-methoxy-N,N-diisopropyltryptamine into Schedule I. Final rule. — Federal Register PMID:12678045
- [5] ^abcAbiero A, Botanas CJ, Sayson LV, Custodio RJ, de la Pena JB, Kim M, Lee HJ, Seo JW, Ryu IS, Chang CM, Yang JS, Lee YS, Jang CG, Kim HJ, Cheong JH (2019) 5-Methoxy-alpha-methyltryptamine (5-MeO-AMT), a tryptamine derivative, induces head-twitch responses in mice through the activation of serotonin receptor 2a in the prefrontal cortex. — Behavioural brain research doi:10.1016/j.bbr.2018.07.020
- [6] ^abcdWagmann L, Brandt SD, Kavanagh PV, Maurer HH, Meyer MR (2017) In vitro monoamine oxidase inhibition potential of alpha-methyltryptamine analog new psychoactive substances for assessing possible toxic risks. — Toxicology letters doi:10.1016/j.toxlet.2017.03.007