Phencyclidine
（重定向自Phenylcyclohexylpiperidine）
Phencyclidine (PCP), also known as angel dust and Sernyl among others, is a dissociative drug. PCP was brought to market in the 1950s as an anesthetic pharmaceutical drug but was taken off the market in 1965 due to the high prevalence of dissociative hallucinogenic side effects. Likewise, ketamine was discovered by Parke-Davis researchers as a better-tolerated derivative for use as an anesthetic pharmaceutical drug. Since this time a number of synthetic derivatives of PCP have been sold as dissociative drugs for recreational and non-medical use.