Delusional parasitosis associated with phenelzine.

A woman developed delusional parasitosis when taking phenelzine. The delusion occurred in an agitated hypomanic state and was preceded by an intense pruritus. It completely remitted following withdrawal of phenelzine combined with a low dose of haloperidol (1 mg/day) for several days. This unusual psychopathology is probably encountered more by dermatologists than by mental health professionals.