Risperidone as monotherapy for a patient with obsessive compulsive disorder comorbid with schizoaffective disorder: a case report.

Data on the efficacy of antipsychotics as monotherapy for obsessive-compulsive disorder (OCD) are inadequate. This report presents the case of a patient with OCD that was successfully treated with risperidone as monotherapy. Assessments revealed significant reductions in OCD symptoms after risperidone treatment (4 mg/d). This report suggests the beneficial effect of risperidone for a patient with OCD comorbid with schizoaffective disorder.