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phencyclidine hydrochloride (PCP)
phencyclidine hydrochloride(fĕn-sĭk′lĭ-dĭn″, -sī′klĭ, -dĭn),
For agitation caused by acute intoxication, diazepam is indicated. Because PCP abusers are often hostile, aggressive, and dangerous, efforts to pacify these patients are contraindicated. Instead, the patient should be isolated in a quiet room and protective measures taken to avoid injury to self or others.
Despite medication and psychotherapy, the psychotic symptoms produced by PCP may persist for weeks or months.