Phencyclidine (PCP)

Often used as a large animal tranquilizer. Abused primarily for its mood altering effects. Low Phencyclidine (PCP) doses produce sedation and euphoric mood changes. Mood can rapidly change from sedation to excitation and agitation. Larger Phencyclidine (PCP) doses may produce a coma-like condition with muscle rigidity and a blank stare. Sudden noises or physical shocks may cause a "freak out" in which the person has abnormal strength, violent behavior, and an inability to speak or comprehend.