clozapine and carbidopa--levodopa-drug-combination

Abrupt clozapine withdrawal can cause rebound psychosis and severe somatic symptoms in psychiatric patients. We report on the case of an advanced Parkinson's disease patient who developed myoclonus, tremor, rigidity, hyperreflexia, and stupor after abrupt clozapine withdrawal. The patient's symptoms resolved with treatment with cyproheptadine. This clinical picture suggests serotonergic rebound as an explanation for the patient's symptoms, although other pharmacological mechanisms are possible. Clozapine should be gradually withdrawn over a period of 1 to 2 weeks when possible, and abruptly discontinued only when necessary.

Topics: Aged; Antipsychotic Agents; Carbidopa; Clozapine; Dose-Response Relationship, Drug; Drug Combinations; Drug Interactions; Drug Therapy, Combination; Hallucinations; Humans; Levodopa; Male; Neurologic Examination; Parkinson Disease; Parkinson Disease, Secondary; Substance Withdrawal Syndrome

Topics: Aged; Antiparkinson Agents; Carbidopa; Clozapine; Dementia; Dose-Response Relationship, Drug; Drug Administration Schedule; Drug Combinations; Female; Humans; Levodopa; Male; Middle Aged; Neurologic Examination; Parkinson Disease; Psychoses, Substance-Induced

Topics: Antiparkinson Agents; Carbidopa; Clozapine; Dose-Response Relationship, Drug; Drug Administration Schedule; Drug Combinations; Humans; Levodopa; Male; Middle Aged; Paranoid Disorders; Parkinson Disease; Psychoses, Substance-Induced