has role has parent hydride independent continuant piperidine benzenes piperidines psychotropic drug anaesthetic neurotoxin NMDA receptor antagonist phencyclidine A member of the class of piperidines that is piperidine in which the nitrogen is substituted with a 1-phenylcyclohexyl group. Formerly used as an anaesthetic agent, it exhibits both hallucinogenic and neurotoxic effects.