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4-HO-MET

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4-HO-MET
Clinical data
Other names4-Hydroxy-N-methyl-N-ethyltryptamine; 4-OH-MET; Metocin; Methylcybin
Routes of
administration		Oral[1]
Drug classSerotonin receptor agonist; Serotonergic psychedelic; Hallucinogen
ATC code
  • None
Legal status
Legal status
  • US: Unscheduled
Schedule I controlled substance in Virginia[2]
Pharmacokinetic data
Duration of action4–6 hours[1][3]
Identifiers
  • 3-{2-[Ethyl(methyl)amino]ethyl}-1H-indol-4-ol
CAS Number
PubChem CID
ChemSpider
UNII
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC13H18N2O
Molar mass218.300 g·mol−1
3D model (JSmol)
  • CCN(C)CCc2c[nH]c1cccc(O)c12
  • InChI=1S/C13H18N2O/c1-3-15(2)8-7-10-9-14-11-5-4-6-12(16)13(10)11/h4-6,9,14,16H,3,7-8H2,1-2H3
  • Key:ORWQBKPSGDRPPA-UHFFFAOYSA-N

4-HO-MET, also known as 4-hydroxy-N-methyl-N-ethyltryptamine or as metocin, is a lesser-known psychedelic drug of the tryptamine family related to psilocin.[1] It is a close structural and functional analogue of psilocin (4-HO-DMT) and is the 4-hydroxyl analogue of methylethyltryptamine (MET).[1] The drug has been encountered as a novel recreational and designer drug.[4]

Effects

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4-HO-MET was first synthesized by Alexander Shulgin.[5][1] In his book TiHKAL (Tryptamines I Have Known and Loved), the dosage is listed as 10 to 20 mg orally and its duration as 4 to 6 hours.[1][6][3] However, a wider recreational dosage range of 2 to 45 mg, with a middle estimate of 15 mg, or more has also been reported.[7]

The effects of 4-HO-MET have been reported to include mydriasis, euphoria, tingling sensations, perceptual changes, closed- and open-eye visuals, synesthesia, time dilation, intensified perceptions, thoughts, and feelings, and a general change in thought processes.[3][8][1]

4-HO-MET is said to produce qualitative effects very similar to those of psilocin.[1][8][3] However, it has also been described as being a relatively or very light and more clear-headed and functional psychedelic with less head space.[8] On the other hand, it is said to still produce strong visuals.[8] This has been described as being analogous to the case of 2C-B.[8]

Interactions

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See also: Psychedelic drug § Interactions, and Trip killer § Serotonergic psychedelic antidotes

Pharmacology

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Pharmacodynamics

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4-HO-MET activities
Target Affinity (Ki, nM)
5-HT1A 135–950 (Ki)
1,390 (EC50Tooltip half-maximal effective concentration)
90% (EmaxTooltip maximal efficacy)
5-HT1B 331
5-HT1D 197
5-HT1E 161
5-HT1F ND
5-HT2A 4.0–177 (Ki)
18–97 (EC50Tooltip half-maximal effective concentration)
54–95% (EmaxTooltip maximal efficacy)
5-HT2B 12 (Ki)
2.64–>20,000 (EC50)
44–71% (Emax)
5-HT2C 141–164 (Ki)
30–113 (EC50)
87–101% (Emax)
5-HT3 ND
5-HT4 ND
5-HT5A 304
5-HT6 70
5-HT7 60
α1A 9,700
α1B, α1D ND
α2A 1,666–2,400
α2B, α2C IA
β1–β3 ND
β2 ND
D1 25,000
D2 4,000
D3 6,700
D4, D5 IA
H1 483–820
H2 IA
H3, H4 ND
M1–M3, M5 ND
M2 IA
I1 ND
σ1, σ2 IA
TAAR1Tooltip Trace amine-associated receptor 1 12,000 (Ki) (mouse)
3,100 (Ki) (rat)
2,500 (EC50) (mouse)
2,100 (EC50) (rat)
>10,000 (EC50) (human)
78% (Emax) (mouse)
71% (Emax) (rat)
SERTTooltip Serotonin transporter 200–2,310 (Ki)
830–9,000 (IC50Tooltip half-maximal inhibitory concentration)
IA (EC50)
NETTooltip Norepinephrine transporter 13,000 (Ki)
11,000 (IC50)
IA (EC50)
DATTooltip Dopamine transporter >26,000 (Ki)
>100,000 (IC50)
IA (EC50)
Notes: The smaller the value, the more avidly the drug binds to the site. All proteins are human unless otherwise specified. Refs: [9][10][11][12][13]

4-HO-MET binds to various serotonin receptors and is known to act as an agonist of the serotonin 5-HT2A, 5-HT2B, 5-HT2C, and 5-HT1A receptors.[9][10][11][12] It is thought that the hallucinogenic effects of serotonergic psychedelics like 4-HO-MET are mediated by serotonin 5-HT2A receptor activation.[14]

Pharmacokinetics

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The metabolism of 4-HO-MET has been studied.[15]

History

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4-HO-MET was first synthesized and discovered by Alexander Shulgin in the 1970s.[8][5][1] It was first described in the scientific literature by David Repke and colleagues by 1981.[16] Subsequently, 4-HO-MET was described by Shulgin in his book TiHKAL (Tryptamines I Have Known and Loved) in 1997.[1] It was encountered as a novel recreational and designer drug in Europe by 2008.[4]

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Finland

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Scheduled in the "government decree on psychoactive substances banned from the consumer market".[17]

Germany

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4-HO-MET is ruled under the Neue-psychoaktive-Stoffe-Gesetz (NpSG) since July 18, 2019. Production and Import with intent to distribute is punishable. Possession is forbidden but not punishable, although ordering it in small quantities can still be seen as an intent to distribute it and be punished.[citation needed]

Sweden

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The Swedish 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, published by Medical Products Agency in their regulation LVFS 2012:6.[18]

United Kingdom

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4-HO-MET is a class A drug in the UK, as a result of the tryptamine catch-all clause.[citation needed]

United States

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4-HO-MET is not scheduled at the federal level in the United States, but it is possible that it could be considered an analogue of psilocin, in which case purchase, sale, or possession could be prosecuted under the Federal Analogue Act.[19]

It is a schedule I substance in some states, such as South Dakota[20] and West Virginia.[21]

See also

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References

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  1. ^ a b c d e f g h i j Shulgin A, Shulgin A (September 1997). "#47 MIPT". Isomer Design. Transform Press. Retrieved 28 November 2023.
  2. ^ "§ 54.1-3446. Schedule I." Virginia Law. Retrieved 29 October 2023.
  3. ^ a b c d Kjellgren A, Soussan C (2011). "Heaven and hell--a phenomenological study of recreational use of 4-HO-MET in Sweden". J Psychoactive Drugs. 43 (3): 211–219. doi:10.1080/02791072.2011.605699. PMID 22111404.
  4. ^ a b "2015 Annual Reports on the implementation of Council Decision 2005/387/JHA". Europol. 2008. Retrieved 30 March 2025.
  5. ^ a b Zamberlan F, Sanz C, Martínez Vivot R, Pallavicini C, Erowid F, Erowid E, et al. (2018). "The Varieties of the Psychedelic Experience: A Preliminary Study of the Association Between the Reported Subjective Effects and the Binding Affinity Profiles of Substituted Phenethylamines and Tryptamines". Front Integr Neurosci. 12: 54. doi:10.3389/fnint.2018.00054. PMC 6235949. PMID 30467466. 4-OH-MET (4-Hydroxy-N-methyl-N-ethyltryptamine): substituted tryptamine and close analog of psilocin, first synthesized by A. Shulgin (Shulgin and Shulgin, 1997).
  6. ^ Shulgin AT (2003). "Basic Pharmacology and Effects". In Laing RR (ed.). Hallucinogens: A Forensic Drug Handbook. Forensic Drug Handbook Series. Elsevier Science. pp. 67–137. ISBN 978-0-12-433951-4.
  7. ^ Luethi D, Liechti ME (October 2018). "Monoamine Transporter and Receptor Interaction Profiles in Vitro Predict Reported Human Doses of Novel Psychoactive Stimulants and Psychedelics". Int J Neuropsychopharmacol. 21 (10): 926–931. doi:10.1093/ijnp/pyy047. PMC 6165951. PMID 29850881.
  8. ^ a b c d e f Palamar JJ, Acosta P (January 2020). "A qualitative descriptive analysis of effects of psychedelic phenethylamines and tryptamines". Human Psychopharmacology. 35 (1): e2719. doi:10.1002/hup.2719. PMC 6995261. PMID 31909513.
  9. ^ a b Rickli A, Moning OD, Hoener MC, Liechti ME (August 2016). "Receptor interaction profiles of novel psychoactive tryptamines compared with classic hallucinogens" (PDF). European Neuropsychopharmacology. 26 (8): 1327–1337. doi:10.1016/j.euroneuro.2016.05.001. PMID 27216487. S2CID 6685927.
  10. ^ a b Glatfelter GC, Naeem M, Pham DN, Golen JA, Chadeayne AR, Manke DR, et al. (April 2023). "Receptor Binding Profiles for Tryptamine Psychedelics and Effects of 4-Propionoxy-N,N-dimethyltryptamine in Mice". ACS Pharmacol Transl Sci. 6 (4): 567–577. doi:10.1021/acsptsci.2c00222. PMC 10111620. PMID 37082754.
  11. ^ a b Kozell LB, Eshleman AJ, Swanson TL, Bloom SH, Wolfrum KM, Schmachtenberg JL, et al. (April 2023). "Pharmacologic Activity of Substituted Tryptamines at 5-Hydroxytryptamine (5-HT)2A Receptor (5-HT2AR), 5-HT2CR, 5-HT1AR, and Serotonin Transporter". J Pharmacol Exp Ther. 385 (1): 62–75. doi:10.1124/jpet.122.001454. PMC 10029822. PMID 36669875.
  12. ^ a b Klein AK, Chatha M, Laskowski LJ, Anderson EI, Brandt SD, Chapman SJ, et al. (April 2021). "Investigation of the Structure-Activity Relationships of Psilocybin Analogues". ACS Pharmacol Transl Sci. 4 (2): 533–542. doi:10.1021/acsptsci.0c00176. PMC 8033608. PMID 33860183.
  13. ^ Simmler LD, Buchy D, Chaboz S, Hoener MC, Liechti ME (April 2016). "In Vitro Characterization of Psychoactive Substances at Rat, Mouse, and Human Trace Amine-Associated Receptor 1". J Pharmacol Exp Ther. 357 (1): 134–144. doi:10.1124/jpet.115.229765. PMID 26791601.
  14. ^ Nichols DE (April 2016). "Psychedelics" (PDF). Pharmacol Rev. 68 (2): 264–355. doi:10.1124/pr.115.011478. PMC 4813425. PMID 26841800.
  15. ^ Bruni PS, Grafinger KE, Nussbaumer S, König S, Schürch S, Weinmann W (September 2018). "Study of the in vitro and in vivo metabolism of 4-HO-MET". Forensic Sci Int. 290: 103–110. doi:10.1016/j.forsciint.2018.06.037. PMID 30015274.
  16. ^ Repke DB, Ferguson WJ, Bates DK (1981). "Psilocin analogs II. Synthesis of 3-[2-(dialkylamino)ethyl]-, 3-[2-( N -methyl- N -alkylamino)ethyl]-, and 3-[2-(cycloalkylamino)ethyl]indol-4-ols". Journal of Heterocyclic Chemistry. 18 (1): 175–179. doi:10.1002/jhet.5570180131. ISSN 0022-152X.
  17. ^ "Valtioneuvoston asetus kuluttajamarkkinoilta kielletyistä psykoaktiivisista aineista" [Government Decree on psychoactive substances banned from the consumer market]. Finlex (in Finnish). Finish Ministry of Justice.
  18. ^ "Föreskrifter om ändring i Läkemedelsverkets föreskrifter (LVFS 2011:10) om förteckningar över narkotika" [Regulations on changes in the Swedish Medicines Agency's regulations (LVFS 2011:10) on lists of narcotics] (PDF) (in Swedish). Elanders Sverige AB. 2012-04-20. Archived from the original (PDF) on 2013-09-28. Retrieved 2014-02-25.
  19. ^ "21 U.S. Code § 841 - Prohibited acts A", LII / Legal Information Institute, retrieved 2016-08-02
  20. ^ "Chapter 34-20B Drugs and Substances Control". South Dakota Legislature. Retrieved 2023-10-09.
  21. ^ "Chapter 60A. Uniform Controlled Substances Act". West Dakota Legislature. Retrieved 2023-10-09.
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