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4-Methoxyphencyclidine (methoxydine, 4-MeO-PCP) is a dissociative anesthetic drug that has been sold online as a research chemical. The synthesis of 4-MeO-PCP was first reported in 1965 by the Parke-Davis medicinal chemist Victor Maddox. A 1999 review published by a chemist using the pseudonym John Q. Beagle suggested the potency of 4-MeO-PCP in man was reduced relative to PCP, two years later Beagle published a detailed description of the synthesis and qualitative effects of 4-MeO-PCP, which he said possessed 70% the potency of PCP. 4-MeO-PCP was the first arylcyclohexylamine research chemical to be sold online, it was introduced in late 2008 by a company trading under the name CBAY and was followed by several related compounds such as 3-MeO-PCP and methoxetamine. 4-MeO-PCP has lower affinity for the NMDA receptor than PCP, but higher affinity than ketamine, it is orally active in a dosage range similar to ketamine, with some users requiring doses in excess of 100mg for desired effects. Users have reported substantial differences in active dose, these discrepancies can be partially explained by the presence of unreacted PCC and other impurities in samples sold on the grey market. Though 4-MeO-PCP has been suggested to possess dopaminergic activity, it is a relatively selective ligand for the NMDA receptor without appreciable affinity for the dopamine transporter.
4-MeO-PCP hydrochloride is a white crystalline solid with a melting point of 181-182°C 
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- Roth, B.; Gibbons, S. (2013). "The Ketamine Analogue Methoxetamine and 3- and 4-Methoxy Analogues of Phencyclidine Are High Affinity and Selective Ligands for the Glutamate NMDA Receptor=PLoS ONE". PLoS ONE 8: e59334. doi:10.1371/journal.pone.0059334.
- "(ACMD) Methoxetamine Report (2012)" (PDF). UK Home Office. 2012-10-18. p. 14. Retrieved 2012-10-22.
- Wallach J, De Paoli G, Adejare A, Brandt S (2013). "Preparation and analytical characterization of 1-(1-phenylcyclohexyl)piperidine (PCP) and 1-(1-phenylcyclohexyl)pyrrolidine (PCPy) analogues". Drug Testing and Analysis.
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