4-HO-MiPT
Psychedelic drug
From Wikipedia, the free encyclopedia
4-HO-MiPT, also known as 4-hydroxy-N-methyl-N-isopropyltryptamine or as miprocin, is a psychedelic drug of the tryptamine and 4-hydroxytryptamine families related to psilocin (4-HO-DMT).[1][3][4] It appears to be similar to psilocin in terms of onset, duration, and effects.[1][3][4] The drug is taken orally.[1][3][4]
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| Other names | 4-OH-MiPT; 4-Hydroxy-N-methyl-N-isopropyltryptamine; Miprocin |
| Routes of administration | Oral[1] |
| Drug class | Non-selective serotonin receptor agonist; Serotonin 5-HT2A receptor agonist; Serotonergic psychedelic; Hallucinogen |
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| Onset of action | 10–20 minutes[1][3] |
| Duration of action | 4–6 hours[1] |
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| Formula | C14H20N2O |
| Molar mass | 232.327 g·mol−1 |
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| Melting point | 123 to 125 °C (253 to 257 °F) |
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It acts as a non-selective serotonin receptor agonist, including of the serotonin 5-HT2A receptor among others.[3][5] The drug is closely related structurally to MiPT, 4-HO-DiPT, and psilocin (4-HO-DMT).[1]
4-HO-MiPT was first described in the literature by David Repke and colleagues in 1981.[6][7][3][8] Its effects in humans were subsequently described by Repke and Alexander Shulgin in 1985[4] and 1997.[1][3]
Use and effects
According to Alexander Shulgin in his book TiHKAL (Tryptamines I Have Known and Loved) and other publications, 4-HO-MiPT has a dose range of 12 to 25 mg, an onset of action of 10 to 20 minutes, a time to peak of 40 to 45 minutes, and a duration of 4 to 6 hours.[1][3][4][9] It has an estimated typical dose of 18.5 mg.[9] The drug has been described as at least twice as potent as psilocin (4-HO-DMT) at comparable doses, with 20 mg 4-HO-MiPT being subjectively stronger than 50 mg psilocin in one individual.[1][3] However, in another person, the effects of 4-AcO-MiPT (a prodrug of 4-HO-MiPT) at a dose of 30 mg were described as considerably more modest than expected.[1]
The effects of 4-HO-MiPT have been reported to include closed-eye visuals, vivid mental imagery, few psychedelic visuals, wave-form visuals, intense color alterations, multiple images of the same object with intense colored halos, illusory alteration of the size and distance of objects, heightening of senses, intensification and enhanced discrimination of sounds, increased sense of bodily processes such as blood flow and muscles, synesthesia of sound and sight, intense alteration in sense of time and distance, feelings of drifting in and out of the body, flight of ideas, philosophical thinking, euphoria, enhanced music appreciation, enhanced eroticism, and facilitation of love, insights, fantasy, introspection, and discovery.[1][3][4] Other effects included intoxication, sedation, feeling drunk, relaxation, some initial anxiety, easy to difficult verbal communication, easy distraction and annoyance by external stimuli such as light, appetite loss, and insomnia.[1][3][4] Physical effects of the drug have been reported to include twitching, muscle sensations, motor incoordination, slight lightheadedness, mild vertigo, jaw clenching, and body tremors.[1][4]
Interactions
Pharmacology
Pharmacodynamics
| Target | Affinity (Ki, nM) |
|---|---|
| 5-HT1A | 5,870 (Ki) 2,590 (EC50) 83% (Emax) |
| 5-HT2A | 113 (Ki) 5.2–306a (EC50) 74a–100% (Emax) |
| 5-HT2B | 10.3 (EC50) 49% (Emax) |
| 5-HT2C | 750 (Ki) 166–261a (EC50) 76–98%a (Emax) |
| SERT | 483 (Ki) 373–423 (IC50) |
| Notes: The smaller the value, the more avidly the drug interacts with the site. Footnotes: a = Stimulation of IP1 formation. Sources: [5][10][11] | |
4-HO-MiPT acts as a non-selective serotonin receptor agonist, including of the serotonin 5-HT2A, 5-HT2B, and 5-HT2C receptors.[3][5][10][11] It shows the highest potency and efficacy as an agonist of the 5-HT2A receptor, moderate potency as a partial agonist of the 5-HT2B receptor, and low potency with high-efficacy as a partial agonist of the 5-HT2C receptor.[5][11] Additionally, the drug has been found to act as a moderate-potency serotonin transporter (SERT) blocker or serotonin reuptake inhibitor.[10] Its low affinity and potency at the 5-HT1A receptor suggest minimal contribution to this drug's effects.[11] 4-HO-MiPT exhibits approximately 7-fold selectivity for activation of the serotonin 5-HT2A receptor over the serotonin 5-HT2C receptor, and 4-fold preference relative to SERT inhibition.[5][10][11] Affinities towards receptors outside of the serotonin receptor family have not yet been assessed.[5][11]
The drug induces the head-twitch response, a behavioral proxy of psychedelic effects, in rodents.[5][9] Its potency for inducing the head-twitch response in mice is about 4- or 5-fold lower than that of psilocin.[5]
Pharmacokinetics
As of February 2026, no studies have characterized the pharmacokinetics of 4‑HO‑MiPT.[5]
Chemistry
4-HO-MiPT, also known as 4-hydroxy-N-methyl-N-isopropyltryptamine, is a synthetic derivative of the substituted tryptamine and 4-hydroxytryptamine families.[1] It is the 4-hydroxy analogue of N-methyl-N-isopropyltryptamine (MiPT) and the N-isopropyl homologue of psilocin (4-HO-DMT).[1]
Properties
4-HO-MiPT appears to be a relatively unstable compound, discoloring quickly if not kept in an inert atmosphere and in a freezer.[1][3] The drug and its prodrug analogue 4-AcO-MiPT have been used as the free base, hydrochloride salt, and fumarate salt.[1][6][7]
Crystal structure
In August 2019, Chadeayne et al. solved the crystal structure of 4-HO-MiPT fumarate.[3][6] Its systematic name is [2-(4-hydroxy-1H-indol-3-yl)ethyl](methyl)propan-2-ylazanium 3-carboxyprop-2-enoate monohydrate.[6] The salt consists of a protonated tryptammonium cation and a 3-carboxyacrylate (hydrogen fumarate) anion in the asymmetric unit along with a water molecule of crystallization.[6]
Synthesis
The chemical synthesis of 4-HO-MiPT has been described.[1][8]
Analogues
Analogues of 4-HO-MiPT include N-methyl-N-isopropyltryptamine (MiPT), 4-AcO-MiPT, 4-MeO-MiPT, 5-MeO-MiPT, 4-HO-DiPT, psilocin (4-HO-DMT), 4-HO-MET, 4-HO-EiBT, and 4-HO-McPT, among others.[1]
History
4-HO-MiPT was first described in the scientific literature by David Repke and colleagues in 1981.[6][7][3][8] Its effects in humans were described by Repke and Alexander Shulgin and colleagues in 1985.[6][7][4] The pharmacology of 4-HO-MiPT at serotonin receptors was described by Dennis McKenna and Repke and colleagues in 1990.[6][12] The effects of 4-HO-MiPT in humans were described in greater detail by Shulgin in his 1997 book TiHKAL (Tryptamines I Have Known and Loved).[1][3]
Society and culture
Legal status
Canada
4-HO-MiPT is not a controlled substance in Canada as of 2025.[13]
Russia
4-HO-MiPT is in Schedule 1 in Russia as an analog of 4-hydroxytryptamine.[citation needed]
Sweden
Sveriges riksdags health ministry Statens folkhälsoinstitut classified 4-HO-MiPT as "health hazard" under the act Lagen om förbud mot vissa hälsofarliga varor (translated Act on the Prohibition of Certain Goods Dangerous to Health) as of 1 November 2005, in regulation SFS 2005:733 listed as "4-hydroxi-N,N-metylisopropyltryptamin (4-HO-MIPT)", making it illegal to sell or possess.[14]
United Kingdom
The substance could also be considered illegal in the United Kingdom under the Misuse of Drugs Act 1971.[citation needed]
United States
4-HO-MiPT is an unscheduled drug in the United States. However, it is arguably an analog of psilocin, which could lead to prosecution under the Federal Analog Act.[citation needed]