PCP stands for phencyclidine, a drug originally developed as an intravenous anesthetic. Parke Davis discontinued the drug in 1965 when doctors discovered patients experienced severe anxiety, delusions and agitation after being given the drug.
Once discontinued for medical use, PCP manufacturing moved to clandestine labs. The drug is used as injections, pills, snorted or smoked and smoked. Injections are less common for street use. When users ingest a pill the effects begin within 30 minutes and last up to 24 hours. It is smoked by spraying onto herbs, such as parsley or marijuana and rolling into a cigarette. Users also dip both tobacco and marijuana cigarettes into a PCP solution for smoking.