4-AcO-MiPT
4-acetoxy-N-methyl-N-isopropyltryptamine
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4-AcO-MiPT (4-acetoxy-N-methyl-N-isopropyltryptamine) — mipracetin — is a synthetic psychedelic of the tryptamine class. It is the acetate ester prodrug of 4-HO-MiPT (miprocin), a close structural analog of 4-AcO-DMT. It activates serotonin receptors in the brain, producing the visual and cognitive shifts characteristic of classical psychedelics.[1]
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psilocybin, psilocin, LSD +3 morepsilocybin, psilocin, LSD, DMT, 4-AcO-DMT, mescaline show less
Alexander Shulgin first evaluated the parent compound 4-HO-MiPT in self-experiments in 1979, describing it as the most interesting in a series of psilocin analogs.[2] The acetate ester form appeared on online research chemical markets in the late 2000s, sold as a legal alternative to psilocybin mushrooms.[3] It remains unscheduled in the United States and Canada, though controlled in several European countries, and no clinical research has been conducted.
Subjective effects include geometric visual patterns, synesthesia, music enhancement, heightened touch, emotional intensification, and euphoria. The experience is more sensory and erotically charged than psilocybin — strong visuals and body awareness without the heavy psychological weight.[2] Thought loops, anxiety during onset, and nausea are characteristic unwanted effects.
4-AcO-MiPT does not produce physical dependence, and no lethal dose data exist for any species. The dominant risk is psychological — panic and psychosis in vulnerable individuals — with a sharp escalation when combined with MAOIs or tramadol, which can trigger life-threatening serotonin overload.[4] No clinical studies have been published; understanding rests on receptor binding data, structural analogy, and community reports.
History[edit]
Discovery
4-HO-MiPT (miprocin), the active form of 4-AcO-MiPT, was first synthesized by David Repke in a systematic study of psilocin analogs.[5] Alexander Shulgin evaluated it by 1979, calling it the most interesting compound in his series and describing 12 mg as "richly insightful and highly erotic".[2] The acetate ester was subsequently prepared alongside 4-AcO-DMT, with acetylation improving chemical stability over the free phenol form.[3]
Research chemical emergence
4-AcO-MiPT appeared on online markets in the late 2000s as a fumarate salt, marketed as a legal alternative to psilocybin mushrooms.[3] Formal pharmacological study arrived in 2023, when Kozell et al. published the first binding and potency data for both the prodrug and its active metabolite.[1] A patent covering crystalline forms of miprocin filed the same year signals growing commercial interest, though no clinical program has been announced.[6]
The name mipracetin follows the naming pattern of other 4-acetoxy tryptamines — psilacetin for 4-AcO-DMT, iprocin for 4-HO-DiPT. Within research chemical communities, 4-AcO-MiPT carries a reputation as the "sensual tryptamine," distinguished by its erotic and music-enhancing qualities — a characterization traceable to Shulgin's original descriptions.
Chemistry[edit]
Structural class
4-AcO-MiPT belongs to the 4-substituted tryptamine family — indole alkaloids defined by an oxygen-bearing group at the 4-position of the indole ring.[7]
It is the acetate ester prodrug of 4-HO-MiPT, paralleling the relationship between psilocybin and psilocin.[8] Its molecular formula is C₁₆H₂₂N₂O₂ (274.36 g/mol), and it is distributed commercially as the fumarate salt.[3]
Pharmacology[edit]
Mechanism of action
4-AcO-MiPT is a prodrug. After ingestion, the body cleaves the acetate ester to release 4-HO-MiPT (miprocin), the pharmacologically active form — the same conversion that turns psilocybin into psilocin.[1] The active metabolite then activates serotonin receptors, particularly the signaling pathway responsible for psychedelic effects across the tryptamine class.[9]
The active metabolite also engages other serotonin receptor subtypes, each contributing to the overall experience.[1] It has moderate affinity for the SERT — unlikely to drive the primary experience at typical doses, but clinically relevant in combination with other serotonergic drugs.[1]
Pharmacokinetics
No human pharmacokinetic data exist specifically for 4-AcO-MiPT. Based on related compounds, ester hydrolysis is the primary metabolic step, followed by liver processing.[10] By analogy to Psilocin, oral bioavailability is estimated around 50%, with peak effects at 2–4 hours and a half-life of 1.5–4 hours.[11]inferred
Neuroscience[edit]
Where it acts
No neuroimaging data exist for 4-AcO-MiPT. By class analogy, the active metabolite disrupts the brain's default mode network — the system that maintains the ordinary sense of self — and loosens the filtering of incoming signals.[12] The result is perceptual intensification, looser associative thinking, and visual pattern generation.
Why it matters
Serotonergic psychedelics trigger changes in brain structure and connectivity that may persist after the acute experience.[12] 4-AcO-MiPT's partial activation of serotonin receptors falls within the range associated with this kind of brain rewiring, though this has not been directly tested.
Whether 4-OH-MiPT produces measurable neuroplasticity remains untested. Its near-full engagement of a secondary serotonin receptor — substantially higher than at the primary target — has unexplored behavioral consequences. No receptor occupancy imaging has been conducted to link oral dose to central receptor engagement.
Subjective Effects[edit]
4-AcO-MiPT produces a sensory, body-aware psychedelic experience. The defining quality is an erotic and tactile richness — the body comes alive, music deepens, and the visual field fills with geometric form.[2] Where most psychedelics turn attention inward, this one opens outward toward sensation.
Within the 4-substituted tryptamine family, 4-AcO-MiPT sits between 4-AcO-DMT and the diisopropyl structural analog 4-AcO-DiPT in intensity and duration.[3] Compared to psilocybin, it is more visually active, less sedating, and less psychologically heavy — with a sensual quality that users consistently distinguish from the introspective depth of classic mushrooms.[2]
Effect Grid
At common doses (15–20 mg oral), the full psychedelic experience manifests: pronounced color enhancement and brightness alteration, visual drifting and symmetrical texture repetition across surfaces, tracers behind moving objects, and emerging internal hallucinations with eyes closed. Auditory distortion and music enhancement become prominent. Thought connectivity intensifies, with pattern recognition enhancement and conceptual thinking producing novel associations.
Emotional enhancement is marked — music, social interactions, and natural environments may feel deeply meaningful. Spontaneous body sensations are more pronounced, with the characteristic tingling/rushing quality. Pupil dilation is clearly visible. Yawning is common. The experience requires 4–8 hours of commitment; sleep is difficult until effects fully resolve.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Visual breathing · Color alteration · Brightness alteration · Environmental patterning · Touch enhancement · Depth perception distortion · Perspective distortion · Symmetrical texture repetition · Tracers · Auditory enhancement · Ganzfeld effect · Holotropic state · Light sensitivity · Peripheral misidentification · Peripheral vision distortion · Proprioceptive distortion · Sound sensitivity · Spatial disorientation · Visual haze / noise · Visual melting · Visual morphing · Auditory distortion · Synesthesia · After-images · Visual diffraction · Visual acuity enhancement · Auditory misinterpretation · Dreaming enhancement · Vestibular distortion · Visual magnification · Sleep-transition hallucinations · Visual processing acceleration · Tinnitus · Visual acuity suppression · Olfactory enhancement · Taste enhancement · Flashbacks · Internal hallucinations · Object transformations · Environmental orbism / cubism · External hallucinations · Object activation · Visual recursion · Auditory hallucinations · Perspective hallucinations · Visual flipping · Visual scenery slicing · Shadow people · Persisting hallucinations
Touch enhancement · Depth perception distortion · Perspective distortion · Symmetrical texture repetition · Tracers · Auditory enhancement · Ganzfeld effect · Holotropic state · Light sensitivity · Peripheral misidentification · Peripheral vision distortion · Proprioceptive distortion · Sound sensitivity · Spatial disorientation · Visual haze / noise · Visual melting · Visual morphing · Auditory distortion · Synesthesia · After-images · Visual diffraction · Visual acuity enhancement · Auditory misinterpretation · Dreaming enhancement · Vestibular distortion · Visual magnification · Sleep-transition hallucinations · Visual processing acceleration · Tinnitus · Visual acuity suppression · Olfactory enhancement · Taste enhancement · Flashbacks · Internal hallucinations · Object transformations · Environmental orbism / cubism · External hallucinations · Object activation · Visual recursion · Auditory hallucinations · Perspective hallucinations · Visual flipping · Visual scenery slicing · Shadow people · Persisting hallucinations
Spontaneous body sensations · Body scan awareness · Appetite suppression · Wakefulness · Bodily lightness · Dry mouth · Insomnia · Laughter fits · Nausea · Physical fatigue · Tactile euphoria · Tingling / electric sensations · Vibrations / buzzing · Bodily heaviness · Body schema distortion · Dizziness · Excessive sweating · Heart rate perception changes · Muscle relaxation · Muscle tension · Restlessness · Yawning · Bodily pressures · Breathing alteration · Bruxism · Dehydration sensation · Headache · Increased urination · Involuntary body movements · Kundalini-like energy · Nystagmus (eye wobbles) · Salivation · Sexual arousal enhancement · Trembling · Vasoconstriction · Sedation · Nasal congestion · Watery eyes · Diarrhea · Vomiting · Bodily dissociation · Tactile hallucination
Wakefulness · Bodily lightness · Dry mouth · Insomnia · Laughter fits · Nausea · Physical fatigue · Tactile euphoria · Tingling / electric sensations · Vibrations / buzzing · Bodily heaviness · Body schema distortion · Dizziness · Excessive sweating · Heart rate perception changes · Muscle relaxation · Muscle tension · Restlessness · Yawning · Bodily pressures · Breathing alteration · Bruxism · Dehydration sensation · Headache · Increased urination · Involuntary body movements · Kundalini-like energy · Nystagmus (eye wobbles) · Salivation · Sexual arousal enhancement · Trembling · Sedation · Nasal congestion · Watery eyes · Diarrhea · Vomiting · Bodily dissociation · Tactile hallucination
Novelty enhancement · Cognitive euphoria · Cognitive flexibility · Increased nature relatedness · Thought connectivity · Pattern recognition enhancement · Conceptual thinking · Immersion enhancement · Cognitive impairment · Creativity enhancement · Humor enhancement · Multiple thought streams · Thought acceleration · Memory suppression · Analysis enhancement · Focus enhancement · Information processing enhancement · Cognitive fatigue · Memory fragmentation · Synchronicity · Thought disorganization · Thought loops · Language enhancement · Analysis suppression · Cognitive dysphoria · Compulsive redosing urge · Confusion · Focus suppression · Information processing suppression · Language suppression · Memory replays · Motivation suppression · Thought deceleration · Motivation enhancement · Thought organization · Delusions of sobriety · Amnesia · Delusions
Increased nature relatedness · Thought connectivity · Pattern recognition enhancement · Conceptual thinking · Immersion enhancement · Cognitive impairment · Creativity enhancement · Humor enhancement · Multiple thought streams · Thought acceleration · Memory suppression · Analysis enhancement · Focus enhancement · Information processing enhancement · Cognitive fatigue · Memory fragmentation · Synchronicity · Thought disorganization · Thought loops · Language enhancement · Analysis suppression · Cognitive dysphoria · Confusion · Focus suppression · Information processing suppression · Language suppression · Memory replays · Motivation suppression · Thought deceleration · Motivation enhancement · Thought organization · Delusions of sobriety · Amnesia · Delusions
Euphoria · Simultaneous emotions · Catharsis · Anxiety · Anxiety suppression · Dysphoria · Irritability
Anxiety suppression · Dysphoria · Irritability
Social connection · Trust enhancement · Communication enhancement · Sociability enhancement · Depersonalization · Flow state · Automaticity · Communication suppression · Ego inflation · Sociability suppression · Social disconnection · Boundary dissolution · Identity alteration · Cognitive disconnection · Ego dissolution · Telepathic feelings
Depersonalization · Flow state · Automaticity · Communication suppression · Ego inflation · Sociability suppression · Social disconnection · Boundary dissolution · Identity alteration · Cognitive disconnection · Ego dissolution · Telepathic feelings
Time cessation
Non-dual awareness · Transpersonal memory access · Transpersonal visions · Cessation · Death-rebirth sequence · Voidness · Near-death experience
Death-rebirth sequence · Voidness · Near-death experience
Mindfulness enhancement · Recursive awareness
Timeline
First alerts appear as a subtle shift in body awareness — faint tingling, mild mood elevation, and a sense that perception is beginning to change. Easily dismissed as anticipation at lower doses.
Effects build steadily. Color enhancement, gentle visual drifting, and increasing thought connectivity signal the developing experience. Yawning, nasal congestion, and spontaneous body sensations are common.
Maximum intensity: pronounced visual patterning, synesthesia, emotional amplification, and deep thought connectivity. Internal hallucinations are vivid with eyes closed. Music enhancement peaks.
Visual and cognitive effects recede gradually. Emotional sensitivity persists longer than perceptual changes. Thought patterns begin to normalize.
Residual mood elevation, enhanced appreciation for surroundings, and mild cognitive openness may persist for several hours. Appetite returns gradually. Some users report mild fatigue.
Safety[edit]
- Acute toxicity
- Low
- Chronic toxicity
- Low
- Withdrawal
- None
- Tolerance buildup
- rapid
- Tolerance reset
- 7 days
- Physical
- None
- Psychological
- Negligible
- Compulsive redosing
- Negligible
- Dose escalation
- Negligible
- Cross-tol.
- psilo · psilocin · LSD
Toxicity
No lethal dose data exist for 4-AcO-MiPT in any species, and no adverse event or overdose case specifically attributable to it has been identified.[13]safety citation needed Class-level data show tryptamine intoxications can cause rapid heart rate, elevated blood pressure, elevated body temperature, and seizures — particularly when combined with serotonergic drugs or MAOIs.[14]
Heart and circulation
No cardiovascular toxicity data exist for 4-AcO-MiPT. Community reports note pupil dilation consistent with mild sympathomimetic activation. Mild, temporary increases in heart rate and blood pressure are expected by class analogy.safety citation needed
Organ toxicity
No liver, kidney, or other organ toxicity data have been published.safety citation needed The absence of data reflects insufficient study, not confirmed safety.
Psychological Risks
No controlled data on psychological risks exist. By class inference from serotonergic psychedelics:
- Acute psychological distress: anxiety, panic, paranoia, and dysphoric crisis can occur at any dose but are more likely above 20 mg, in unsupported settings, or in predisposed individuals
- Psychosis precipitation: serotonergic psychedelics can trigger psychotic episodes in individuals with personal or family history of psychotic spectrum disorderssafety citation needed
- HPPD: Persistent perceptual changes after the experience are reported across the psychedelic class; no specific reports are linked to 4-AcO-MiPTsafety citation needed
- Thought loops: Reported among cognitive effects, contributing to acute distress at higher doses
The compound's partial activation of serotonin receptors suggests a ceiling on effect intensity relative to full agonists, but this does not eliminate psychological risk.inferred
Tolerance & Dependence
Tolerance builds rapidly via serotonin downregulation and resets fully within approximately 7 days.[9]inferred Cross-tolerance with other serotonergic psychedelics — including LSD, psilocybin, and DMT — is expected via the shared mechanism.[9] 4-AcO-MiPT is not habit-forming; no physical dependence, withdrawal, or escalating use patterns have been documented.[15]
Drug Interactions
Serotonin syndrome risk
The primary interaction danger is serotonin syndrome — a life-threatening response involving overheating, muscle rigidity, and seizures — triggered when 4-AcO-MiPT is combined with agents that increase serotonin activity.[1]
Tramadol: Dangerous combination. Tramadol blocks serotonin reuptake while acting as an opioid.[16] Combined with 4-AcO-MiPT's serotonin activation, this creates significant serotonin syndrome risk.[4][17]
MAOIs: Dangerous combination. Monoamine oxidase inhibitors prevent serotonin from being broken down. Combined with a serotonin receptor activator, this causes severe amplification of both psychedelic effects and serotonin toxicity.[14]safety citation needed
SSRIs/SNRIs: chronic use attenuates psychedelic effects via serotonin receptor downregulation. Acute combination increases serotonin syndrome risk.[4]
Metabolic interactions
By analogy to psilocin, liver enzymes (CYP2D6 and CYP3A4) are expected to process the active metabolite.[11] Inhibitors of these enzymes may increase plasma levels, intensifying and prolonging effects.inferred
Cannabis
The interaction with cannabis is uncharacterized. No published data exist to assess risk or effect modification.citation needed
Contraindications
- Psychotic disorders and schizophrenia spectrum (personal or family history): Absolute contraindicationsafety citation needed
- Concurrent MAOI use: Absolute contraindication — severe serotonin syndrome risk[14]
- Concurrent tramadol use: Absolute contraindication — serotonin syndrome risk[4]
- Bipolar disorder: Relative contraindication — may trigger manic episodessafety citation needed
- Heart conditions: Relative contraindication — sympathomimetic effects expectedsafety citation needed
- Pregnancy and breastfeeding: Standard precautionary contraindication — no reproductive data existsafety citation needed
All contraindications are class-level inference. No substance-specific studies have been conducted.
Harm Reduction[edit]
Forms & Identification
4-AcO-MiPT circulates as a fumarate salt powder. Standard reagent tests (Marquis, Mecke) confirm tryptamine presence but cannot distinguish it from 4-AcO-DMT or other 4-substituted analogs. Quantitative testing via HPLC or mass spectrometry through drug checking services is the only reliable way to confirm identity and purity.
Active doses are measured in milligrams. A milligram-capable scale (±1 mg) is the minimum standard for accurate dosing. For doses below 15 mg, volumetric dosing from a prepared solution provides additional safety margin.
Guidelines
- Test substance identity with reagent kits; use drug checking services where available
- Weigh doses on a milligram-capable scale — never estimate by eye
- Start with a low dose (10–15 mg) to assess individual sensitivity before exploring higher ranges
- Allow at minimum 7 days between experiences to permit full tolerance reset
- Prepare the space: comfortable temperature, accessible water, familiar music, minimal obligations for the following day
- Eat lightly 2–3 hours before dosing to reduce nausea during onset
- Have a trusted sitter present, particularly at doses above 20 mg
- Keep a phone accessible for emergencies but minimize digital stimulation during the experience
Set & Setting
The sensory and emotionally amplifying character of 4-AcO-MiPT makes environment choice significant. Comfortable, familiar, private settings draw out the tactile and euphoric qualities. Unfamiliar or socially demanding environments increase the likelihood of anxiety, thought loops, and somatic discomfort.
A trusted sitter — someone sober and informed about psychedelic crisis support — is advisable at any dose above the low range, particularly for those without prior tryptamine experience.
Aftercare & integration. The days after a 4-AcO-MiPT experience may bring a gentle afterglow or mild fatigue. Prioritize sleep, hydration, and light nutrition.
For meaningful or challenging experiences, journaling within 24–48 hours captures insights before they fade. Discussing the experience with a trusted friend or integration-focused therapist helps process difficult emotional material. Avoid major life decisions in the immediate aftermath — allow several days for perspective to stabilize.
If disturbing perceptual changes, intrusive thoughts, or persistent anxiety continue beyond a few days, seek professional support from a provider familiar with psychedelic experiences.
Recovery & Support
4-AcO-MiPT does not produce physical dependence or withdrawal. Psychological patterns — using psychedelics to avoid processing difficult emotions, or increasing frequency despite diminishing returns — are best addressed through honest self-assessment.
If psychedelic use has become a way to escape rather than explore, or if experiences are causing more distress than insight, reducing frequency or pausing is appropriate. Peer support communities, psychedelic integration circles, and therapists specializing in altered states can provide structure.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency:
Most difficult moments during 4-AcO-MiPT experiences are uncomfortable but not medically dangerous. Seek immediate help if:
- The person expresses intent to harm themselves or others
- Sustained confusion with complete disconnection from reality (unable to respond to name, unaware of surroundings)
- Seizure activity
- Chest pain or irregular heartbeat
- Body temperature noticeably elevated (hot to touch, not sweating)
Immediate steps:
- Move the person to a quiet, safe space
- Speak calmly and simply — "You took a substance. You are safe. This will end."
- Do not restrain unless there is immediate danger of self-harm
- If unconscious, place in the recovery position
- Call emergency services if any red flag above is present or if you are unsure
What to tell the dispatcher:
Name the substance (4-AcO-MiPT or "a synthetic tryptamine psychedelic"), approximate dose, time taken, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during drug emergencies.
Legal Status[edit]
4-AcO-MiPT is unscheduled in several major markets but explicitly controlled in others through tryptamine catch-all provisions or novel psychoactive substance legislation.[18][3]
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States | Not specifically scheduled | No direct federal scheduling. The Federal Analogue Act (21 U.S.C. § 813) may apply as 4-AcO-MiPT is a structural analog of psilocin (Schedule I), if intended for human consumption[18] |
| United Kingdom | Class A (Misuse of Drugs Act 1971) | Controlled under the tryptamine catch-all clause. 4-HO-MiPT is explicitly Class A; as its ester, 4-AcO-MiPT falls under the same classification[3] |
| Germany | Controlled (NpSG) | Prohibited under the New Psychoactive Substances Act since July 18, 2019[3] |
| Sweden | Scheduled substance | Listed under the Act on the Prohibition of Certain Health-Hazardous Goods since November 1, 2005[18] |
| Finland | Banned | Prohibited under regulation covering 100+ psychoactive chemicals since December 2014[18] |
| Canada | Not specifically controlled | Not listed in the Controlled Drugs and Substances Act schedules[3] |
| Australia | Uncertain | No specific scheduling identified. May fall under analog provisions depending on jurisdictional interpretationcitation needed |
Legal status can change without notice. This information is sourced from community databases and should be independently verified against current legislation in the relevant jurisdiction.
references
- [1]
- [2]
- [3]
- [4] ^abcdMalcolm B, Thomas K (2022) Serotonin toxicity of serotonergic psychedelics — Psychopharmacology doi:10.1007/s00213-021-05876-x
- [5] ^Repke (1985) Psilocin analogs II. Synthesis of 3-[2-(dialkylamino)ethyl]-, 3-[2-(N-methyl-N-alkylamino)ethyl]-, and 3-[2-(cycloalkylamino)ethyl]indol-4-ols
- [6]