4-HO-McPT, 4-hydroxy-N-methyl-N-cyclopropyltryptamine, is a derivative of tryptamine known for its psychedelic properties. It exerts serotonergic effects, contributing to its psychoactive nature. Although it has been available as a designer drug in the market since approximately 2016, forensic laboratories didn’t definitively identify it until 2018. Notably, 4-HO-McPT is classified as illegal in Finland.

IUPAC name
CAS Number2883663-05-4 
PubChem CID155253443
Chemical and physical data
Molar mass230.306 g·mol−1


1. What is 4-HO-McPT?

  • 4-HO-McPT, short for 4-hydroxy-N-methyl-N-cyclopropyltryptamine, is a psychedelic tryptamine derivative known for its psychoactive effects.

2. How does 4-HO-McPT work?

  • 4-HO-McPT primarily exerts its effects by interacting with the serotonin receptors in the brain, resulting in altered perception, mood changes, and other psychedelic experiences.

3. When did 4-HO-McPT first appear on the market?

  • 4-HO-McPT reportedly became available as a designer drug around 2016, although forensic laboratories didn’t identify it definitively until 2018.

4. What are the reported effects of 4-HO-McPT?

  • Users have reported various effects, including visual and auditory distortions, mood changes, and altered perception of time and space. However, the exact experiences can vary widely among individuals.

5. Is 4-HO-McPT legal?

  • The legal status of 4-HO-McPT varies by country and jurisdiction. It’s important to check local regulations and laws, as it may be considered illegal in some areas.

6. Are there any safety precautions for using 4-HO-McPT?

  • Like with any psychedelic substance, caution should be exercised. Start with a low dose, preferably in a safe and controlled environment, and consider having a sober and experienced sitter present. Be aware of potential interactions with other substances and any personal medical conditions.

7. How can one ensure the purity of 4-HO-McPT?

  • To ensure the substance’s purity, obtaining it from reputable sources is advisable. Additionally, you can have samples tested by analytical methods if you doubt their authenticity.

8. Is there any ongoing research on the potential medical uses of 4-HO-McPT?

  • Currently, 4-HO-McPT is primarily considered a research chemical, and its medical applications are not established. However, research in this area may continue in the future.

9. How does 4-HO-McPT compare to other psychedelics like psilocybin or LSD?

  • 4-HO-McPT is chemically related to other psychedelics like psilocybin but can have distinct effects and experiences associated with its use. It’s essential to recognize that each substance has its unique properties.

10. Where can I find more information about 4-HO-McPT?

  • You can find more information about 4-HO-McPT in scientific literature, research papers, and online resources dedicated to psychedelics. Always ensure that the information you access is from reputable sources.


  1. United States Application 2019142851, filed by Andrew R. Chadeayne, pertains to “Compositions Comprising a Psilocybin Derivative and a Cannabinoid.” It was published on May 16, 2019, and was originally assigned to CaaMTech LLC but is now abandoned.
  2. In March 2018, Chapman SJ authored a publication titled “PeakAL: Protons I Have Known and Loved, Too — Another Fifty Shades of Grey-Market Spectra.” This work was featured in the Blotter journal, Volume 3, Issue 1. doi:10.16889/isomerdesign-5.
  3. An “Analytical Report: 4-HO-McPT” in PDF format was issued by the Nacionalni Forenzični Laboratorij in Slovenia in September 2018.
  4. Valtioneuvoston asetus kuluttajamarkkinoilta kielletyistä psykoaktiivisista aineista refers to a government regulation in Finland regarding prohibited psychoactive substances in consumer markets.

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