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Summary sheet: 4-HO-MET
Chemical Nomenclature
Common names 4-HO-MET, Metocin, Methylcybin, Colour
Substitutive name 4-Hydroxy-N-methyl-N-ethyltryptamine
Systematic name 3-{2-[Ethyl(methyl)amino]ethyl}-1H-indol-4-ol
Class Membership
Psychoactive class Psychedelic
Chemical class Tryptamine
Routes of Administration

WARNING: Always start with lower doses due to differences between individual body weight, tolerance, metabolism, and personal sensitivity. See responsible use section.

Threshold 5 mg
Light 10 - 25 mg
Common 25 - 35 mg
Strong 35 - 60 mg
Heavy 60 mg +
Total 25 - 45 minutes
Onset 15 - 120 seconds
Threshold 5 mg
Light 5 - 15 mg
Common 15 - 25 mg
Strong 25 - 45 mg
Heavy 45 mg +
Total 4 - 6 hours
Onset 15 - 40 minutes
Come up 30 - 60 minutes
Peak 2 - 3 hours
Offset 1 - 1.5 hours
After effects 2 - 12 hours

DISCLAIMER: PW's dosage information is gathered from users and resources for educational purposes only. It is not a recommendation and should be verified with other sources for accuracy.


4-Hydroxy-N-methyl-N-ethyltryptamine (also known as colour,[1] methylcybin,[1] metocin,[1] and 4-HO-MET) is a lesser-known novel psychedelic substance of the tryptamine class. 4-HO-MET is structurally related to psilocin, the active ingredient in psilocybin mushrooms ("magic mushrooms"). It is thought to produce its effects by binding to serotonin receptors in the brain.

4-HO-MET was first synthesized by the American chemist Alexander Shulgin, who documented it in his 1997 book TiHKAL ("Tryptamines I Have Known and Loved"). Reports of human use began to surface in the late 2000s, following its appearance on the online research chemical market. It has been sold alongside other psilocybin analogues such as 4-AcO-DMT and 4-HO-MiPT.

Subjective effects include geometric visual hallucinations, time distortion, enhanced introspection, and ego loss. Users typically describe 4-HO-MET as a more recreational version of psilocybin mushrooms or psilocin (4-HO-DMT) due to its less serious headspace and greater emphasis on visual effects. Its psychedelic visuals are reported to be vivid and colorful.

Very little data exists about the pharmacological properties, metabolism, and toxicity of 4-HO-MET. It is assumed to have a similar risk and toxicity profile as psilocin and 4-AcO-DMT but there is no data to support this. It is highly advised to use harm reduction practices if using this substance.


4-HO-MET, or 4-hydroxy-N-ethyl-N-methyltryptamine, is a synthetic indole alkaloid molecule of the tryptamine chemical class. Tryptamines share a core structure comprised of a bicyclic indole heterocycle attached at R3 to an amino group via an ethyl side chain. 4-HO-MET is substituted at R4 of its indole heterocycle with a hydroxyl functional group OH−. It also contains a methyl group and an ethyl chain bound to the terminal amine RN of its tryptamine backbone (MET).

4-HO-MET is a 4-hydroxy homolog of 4-AcO-MET and the N-substituted ethyl homolog of psilocin (4-HO-DMT).[2] It is also the 4-hydroxyl analog of the base tryptamine MET.


Further information: Serotonergic psychedelic

4-HO-MET's psychedelic effects are believed to come from its activity at the 5-HT2A receptor as a partial agonist. However, the role of these interactions and how they result in the psychedelic experience remains subject to on-going scientific investigation.

Binding Sites Binding Affinity Ki (µM)[3]
5-HT1A 0.228
5-HT2A 0.057
5-HT2C 0.141
D1 >25
D2 4
D3 6.7
α1A 9.7
α2A 2.4
TAAR1 3.1
H1 0.82
SERT 0.2
DAT >26
NET 13

Subjective effects

A large body of anecdotal reports suggests that the active dose can vary greatly. Some users report very heavy experiences with doses as low as 17mg, while others report light experiences with doses as high as 30 mg.[4] Possible causes may be attributed to individual differences in neurochemistry and metabolism as well as variations in batch quality and physical forms (e.g. HCl vs. fumarate salt).

The experiences reported indicate hallucinatory states coming in waves of euphoria, swapping from moments of sobriety to intense visuals. Because 4-HO-MET is heavy on visuals and light on cognitive distress, it can be described as a recreational and practical alternative to psilocybin mushrooms, with thematic similarities in visual effects.

Disclaimer: The effects listed below cite the Subjective Effect Index (SEI), an open research literature based on anecdotal user reports and the personal analyses of PsychonautWiki contributors. As a result, they should be viewed with a healthy degree of skepticism.

It is also worth noting that these effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects. Likewise, adverse effects become increasingly likely with higher doses and may include addiction, severe injury, or death ☠.

Physical effects

Visual effects

Cognitive effects

Multi-sensory effects

Transpersonal effects

Combination effects

  • Cannabis - When used in conjunction with cannabis, both the visual and cognitive effects of 4-HO-MET can be intensified and extended with extreme efficacy. This should be used with extreme caution, however, especially if one is not experienced with psychedelics as this can also amplify the anxiety, confusion and psychosis producing aspects of cannabis significantly.
  • Dissociatives - When used in combination with dissociatives, the geometry, euphoria, dissociation and hallucinatory effects are often greatly enhanced. Dissociative-induced holes, spaces, and voids while under the influence of 4-HO-MET can result in significantly more vivid visuals than dissociatives alone present, along with more intense internal hallucinations, confusion, delusions and chances of a psychotic reaction.
  • MDMA - When used in conjunction with MDMA, the physical and cognitive effects of MDMA are amplified. The visual, physical and cognitive effects of 4-HO-MET are also intensified with an overwhelming euphoric pleasure manifested through uniquely pleasurable body highs and headspaces, and uniquely colorful and awe-inspiring visuals. The synergy between these substances is unpredictable, and it is best to start with markedly lower dosages than one would take for both substances individually.
  • Alcohol - This interaction is not typically recommended due to alcohol’s ability to cause dehydration, which can negatively affect a trip if taken in high dosages. This combination is, however, reasonably safe in low doses and when used responsibly, this can often "take the edge off the trip" as well as dull its psychedelic effects in a fashion somewhat similar to benzodiazepines, albeit more in a more stressful way on the body.
  • Benzodiazepines - When used in combination with benzodiazepines, benzodiazepines can, depending on the dosage, slightly to completely reduce the intensity of the cognitive, physical and visual effects of a 4-HO-MET trip. With higher doses, they are very efficient at stopping "bad trips" at the cost of reduced trip intensity and in the worst case, amnesia and blacking out. Caution is advised when acquiring them for this purpose, however, due to the very high addiction potential that benzodiazepines possess. It is generally advised to refrain from intending to use them at all unless the trip suddenly becomes completely overwhelming.

Experience reports

Anecdotal reports which describe the effects of this compound within our experience index include:

Additional experience reports can be found here:

Toxicity and harm potential

The toxicity and long-term health effects of recreational 4-HO-MET use do not seem to have been studied in any scientific context and the exact toxic dose is unknown. This is because 4-HO-MET is a research chemical with very little history of human usage. However, there are reports of very high doses leading to drug induced psychosis.[5]

Anecdotal evidence from those who have tried 4-HO-MET suggests that there are no negative health effects attributed to simply trying the substance by itself at low to moderate doses and using it very sparingly (but nothing can be completely guaranteed). Independent research should always be done to ensure that a combination of two or more substances is safe before consumption.

It is strongly recommended that one use harm reduction practices when using this substance.

Tolerance and addiction potential

4-HO-MET is not habit-forming, and the desire to use it can actually decrease with use. It is most often self-regulating.

Tolerance to the effects of 4-HO-MET is built almost immediately after ingestion. After that, it takes about 3 days for the tolerance to be reduced to half and 7 days to be back at baseline (in the absence of further consumption). 4-HO-MET presents cross-tolerance with all psychedelics, meaning that after the consumption of 4-HO-MET all psychedelics will have a reduced effect.

Dangerous interactions

Warning: Many psychoactive substances that are reasonably safe to use on their own can suddenly become dangerous and even life-threatening when combined with certain other substances. The following list provides some known dangerous interactions (although it is not guaranteed to include all of them).

Always conduct independent research (e.g. Google, DuckDuckGo, PubMed) to ensure that a combination of two or more substances is safe to consume. Some of the listed interactions have been sourced from TripSit.

Legal status

  • Austria: 4-HO-MET is illegal to possess, produce and sell under the NPSG (Neue-Psychoaktive-Substanzen-Gesetz Österreich).[citation needed]
  • Canada: 4-HO-MET is unscheduled in Canada.
  • Germany: 4-HO-MET is controlled under the NpSG[7] (New Psychoactive Substances Act) as of July 18, 2019.[8] Production and import with the aim to place it on the market, administration to another person, placing it on the market and trading is punishable. Possession is illegal but not punishable.[9][10] The legislator considers it possible that orders of 4-HO-MET are punishable as an incitement to place it on the market.[11]
  • Japan: 4-HO-MET is a controlled substance in Japan effective March 25th, 2015.[12]
  • Poland: 4-HO-MET is illegal to posses, manufacture and sell under "Wykaz środków odurzających i substancji psychotropowych" (Group I-P) [13]
  • Sweden: Sveriges Riksdag added 4-HO-MET to Schedule I ("substances, plant materials and fungi which normally do not have medical use") as narcotics in Sweden as of May 1, 2012.[14]
  • Switzerland: 4-HO-MET is a controlled substance specifically named under Verzeichnis E.[15]
  • United Kingdom: 4-HO-MET is a Class A drug in the United Kingdom as a result of the tryptamine catch-all clause.[16]
  • United States: 4-HO-MET is unscheduled in the United States. It may be considered an analogue of psilocin (4-HO-DMT), a Schedule I drug under the Controlled Substances Act. As such, the sale for human consumption or the use for illicit non-medical or industrial intents and purposes could be prosecuted as crimes under the Federal Analogue Act.[citation needed]

See also

External links



  1. 1.0 1.1 1.2 "4-HO-MET". The Vaults of Erowid. Erowid. August 18, 2011. Retrieved August 27, 2020. 
  2. Shulgin, Alexander; Shulgin, Ann (1997). "#21. 4-HO-MET". TiHKAL: The Continuation. United States: Transform Press. ISBN 0-9630096-9-9. OCLC 38503252. 
  3. Rickli, A.; Moning, O.D.; Hoener, M. C.; Liechti, M. E. (2016). "Receptor interaction profiles of novel psychoactive tryptamines compared with classic hallucinogens". 26 (8): 1327–1337doi=10.1016/j.euroneuro.2016.05.001. ISSN 0924-977X. OCLC 795935172. PMID 27216487. 
  4. "4-HO-MET: Dose". The Vaults of Erowid. Erowid. August 18, 2011. Retrieved August 27, 2020. 
  5. Täljemark, J.; Johansson, B. A. (2012). "Drug-induced acute psychosis in an adolescent first-time user of 4-HO-MET". European Child & Adolescent Psychiatry. 21 (9): 527–528. doi:10.1007/s00787-012-0282-9. eISSN 1435-165X. ISSN 1018-8827. OCLC 26585556. PMID 22580963. 
  6. Talaie, H.; Panahandeh, R.; Fayaznouri, M. R.; Asadi, Z.; Abdollahi, M. (2009). "Dose-independent occurrence of seizure with tramadol". Journal of Medical Toxicology. 5 (2): 63–67. doi:10.1007/BF03161089. ISSN 1556-9039. 
  7. "Anlage NpSG" (in German). Bundesamt für Justiz [Federal Office of Justice]. Retrieved December 10, 2019. 
  8. "Verordnung zur Änderung der Anlage des Neue-psychoaktive-Stoffe-Gesetzes und von Anlagen des Betäubungsmittelgesetzes" (PDF). Bundesgesetzblatt Jahrgang 2019 Teil I Nr. 27 (in German). Bundesanzeiger Verlag. July 17, 2019. pp. 1083–1094. ISSN 0341-1095. 
  9. "§ 4 NpSG" (in German). Bundesamt für Justiz [Federal Office of Justice]. Retrieved December 10, 2019. 
  10. "§ 3 NpSG" (in German). Bundesamt für Justiz [Federal Office of Justice]. Retrieved December 10, 2019. 
  11. "Gesetzentwurf der Bundesregierung: Entwurf eines Gesetzes zur Bekämpfung der Verbreitung neuer psychoaktiver Stoffe" (PDF) (in German). Deutscher Bundestag. May 30, 2016. p. 20. Drucksache 18/8579. 
  12. "危険ドラッグの成分16物質を新たに指定薬物に指定" (in Japanese). 厚生労働省 [Ministry of Health, Labour and Welfare (MHLW)]. Retrieved May 2, 2022.
  13. Wykaz środków odurzających i substancji psychotropowych (in Polish), 2022 
  14. "Föreskrifter om ändring i Läkemedelsverkets föreskrifter (LVFS 2011:10) om förteckningar över narkotika" (PDF) (in Swedish). Läkemedelsverket [Medical Products Agency ] (published April 30, 2012). April 20, 2012. ISSN 1101-5225. LVFS 2012:6. Archived from the original (PDF) on October 31, 2018. 
  15. "Verordnung des EDI über die Verzeichnisse der Betäubungsmittel, psychotropen Stoffe, Vorläuferstoffe und Hilfschemikalien" (in German). Bundeskanzlei [Federal Chancellery of Switzerland]. Retrieved January 1, 2020. 
  16. "Schedule 2: Part I: Class A Drugs". "Misuse of Drugs Act 1971". UK Government. Retrieved August 20, 2020.