IUPAC name
763035-03-6 (Freebase) N
77872-42-5 (Hydrochloride) N
3D model (Jmol) Interactive image
ChemSpider 10513074 YesY
Molar mass 232.33 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

4-Hydroxy-N-methyl-N-propyltryptamine, commonly known as 4-HO-MPT or meprocin, is a psychedelic drug in the tryptamine class of chemical compounds and is a higher homologue of the naturally occurring substituted tryptamine psilocin as well as being the 4-hydroxyl analog of MPT.


4-HO-MPT was first synthesized and bioassayed by biochemist Alexander Shulgin and written about in his 1994 book TiHKAL.[1]

Dosage and duration

For psychedelic effects, the dosage and duration are listed as "unknown" in TiHKAL.[1]


Very little data exists about the pharmacological properties, metabolism, and toxicity of 4-HO-MPT. In a single trial of 8 mg orally of 4-HO-MPT HCl from TiHKAL, it is described as producing visual distortion, vertigo, and slight insomnia.[1]

Legal status

4-HO-MPT is not scheduled by the United Nations' Convention on Psychotropic Substances.[2]

United States

4-HO-MPT is not scheduled at the federal level in the United States,[3] but it is possible that 4-HO-MPT could legally be considered an analog of psilocin, in which case, sales or possession with intent for human consumption could potentially be prosecuted under the Federal Analogue Act.[4]


External links

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