Risperidone (Risperdal 1mg) is an antipsychotic drug which is mainly used to treat schizophrenia, schizoaffective disorder, the mixed and manic states associated with bipolar disorder, and irritability in people with autism. Risperidone belongs to the class of atypical antipsychotics. It is a dopamine antagonist possessing antiserotonergic, antiadrenergic and antihistaminergic properties. Greatest EPS of atypical antypsychotic, especially over 6 mg/day. Developed 2nd after clozapine.