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Clinical data
Other names3-Hydroxyphencyclidine; 3-OH-PCP; PCP-3-OH
Legal status
Legal status
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass259.39 g/mol g·mol−1
3D model (JSmol)

3-Hydroxyphencyclidine (3-HO-PCP) is a dissociative hallucinogen of the arylcyclohexylamine class related to phencyclidine (PCP) that has been sold online as a designer drug.[1]


3-HO-PCP acts as a high-affinity uncompetitive antagonist of the NMDA receptor via the dizocilpine (MK-801) site (Ki = 30 nM).[2][3] It has much higher affinity than PCP for this site (Ki = 250 nM, for comparison; 8-fold difference).[3] The drug also has high affinity for the μ-opioid receptor (MOR) (Ki = 39–60 nM),[2][3][4][5] the κ-opioid receptor (KOR) (Ki = 140 nM),[4] and the sigma σ1 receptor (Ki = 42 nM; IC50 = 19 nM),[4][6][7][8] whereas it has only low affinity for the δ-opioid receptor (Ki = 2,300 nM).[4] The high affinity of 3-HO-PCP for opioid receptors is unique among arylcyclohexylamines and is in contrast to PCP, which has only very low affinity for the MOR (Ki = 11,000–26,000 nM; 282- to 433-fold difference) and the other opioid receptors (Ki = 4,100 nM for the KOR and 73,000 nM for the DOR).[3][4]

Although it was hypothesized that 3-HO-PCP might be a metabolite of PCP in humans, there is no evidence that this is the case.[9][10]


3-HO-PCP is an arylcyclohexylamine.[2] Close analogues of 3-HO-PCP include PCP, 3-MeO-PCP, 4-MeO-PCP, 3-MeO-PCMo, and somewhat more distantly ketamine, methoxyketamine, 3-MeO-PCE, methoxetamine and 4-(dimethylamino)-4-(p-tolyl)cyclohexanone.[2]

Society and culture[edit]

Legal status[edit]


3-HO-PCP is legal in Germany.[citation needed]

United Kingdom[edit]

On October 18, 2012 the Advisory Council on the Misuse of Drugs in the United Kingdom released a report about methoxetamine, saying that the "harms of methoxetamine are commensurate with Class B of the Misuse of Drugs Act (1971)", despite the fact that the act does not classify drugs based on harm. The report went on to suggest that all analogues of MXE should also become class B drugs and suggested a catch-all clause covering both existing and unresearched arylcyclohexamines, including 3-HO-PCP.[11]

United States[edit]

3-HO-PCP is a close analogue of PCP. Hence, possession or distribution for use in humans could potentially be prosecuted under the Federal Analogue Act.[citation needed]


  1. ^ Morris, H.; Wallach, J. (2014). "From PCP to MXE: a comprehensive review of the non-medical use of dissociative drugs". Drug Testing and Analysis. 6 (7–8): 614–632. doi:10.1002/dta.1620. PMID 24678061.
  2. ^ a b c d Morris H, Wallach J (2014). "From PCP to MXE: a comprehensive review of the non-medical use of dissociative drugs". Drug Test Anal. 6 (7–8): 614–32. doi:10.1002/dta.1620. PMID 24678061.
  3. ^ a b c d Kamenka JM, Chiche B, Goudal R, Geneste P, Vignon J, Vincent JP, Lazdunski M (1982). "Chemical synthesis and molecular pharmacology of hydroxylated 1-(1-phenylcyclohexyl-piperidine derivatives". J. Med. Chem. 25 (4): 431–5. doi:10.1021/jm00346a019. PMID 6279847.
  4. ^ a b c d e Johnson N, Itzhak Y, Pasternak GW (1984). "Interaction of two phencyclidine opiate-like derivatives with 3H-opioid binding sites". Eur. J. Pharmacol. 101 (3–4): 281–4. doi:10.1016/0014-2999(84)90171-7. PMID 6088255.
  5. ^ Itzhak Y, Kalir A, Sarne Y (1981). "On the opioid nature of phencyclidine and its 3-hydroxy derivative". Eur. J. Pharmacol. 73 (2–3): 229–33. doi:10.1016/0014-2999(81)90097-2. PMID 6273187.
  6. ^ Itzhak Y, Hiller JM, Simon EJ (1985). "Characterization of specific binding sites for [3H](d)-N-allylnormetazocine in rat brain membranes". Mol. Pharmacol. 27 (1): 46–52. PMID 3965930.
  7. ^ Itzhak Y (1987). "[3H]PCP-3-OH and (+)[3H]SKF 10047 binding sites in rat brain membranes: evidence of multiplicity". Eur. J. Pharmacol. 136 (2): 231–4. doi:10.1016/0014-2999(87)90715-1. PMID 3036548.
  8. ^ Itzhak Y (1988). "Pharmacological specificity of some psychotomimetic and antipsychotic agents for the sigma and PCP binding sites". Life Sci. 42 (7): 745–52. doi:10.1016/0024-3205(88)90646-7. PMID 2893238.
  9. ^ Holsztynska EJ, Domino EF (1985). "Biotransformation of phencyclidine". Drug Metab. Rev. 16 (3): 285–320. doi:10.3109/03602538508991437. PMID 3914938.
  10. ^ Holsztynska EJ, Domino EF (1986). "Quantitation of phencyclidine, its metabolites, and derivatives by gas chromatography with nitrogen-phosphorus detection: application for in vivo and in vitro biotransformation studies". J Anal Toxicol. 10 (3): 107–15. doi:10.1093/jat/10.3.107. PMID 3724069.
  11. ^ "(ACMD) Methoxetamine Report (2012)" (PDF). UK Home Office. 2012-10-18. p. 14. Retrieved 2015-06-24.