Com or upon request by calling Roxane Laboratories Technical Product Information at. Tardive Dyskinesia syndrome of potentially irreversible, involuntary, dyskinetic movements may develop in patients treated with antipsychotic drugs. The structural formula is: Risperidone is white to kjop billige risperidone on line slightly beige powder. Real-Time continuous streaming quotes are available through our premium service. Lipscombe said that if antipsychotic drugs are prescribed for diabetic with dementia, family members and health-care providers need to keep an eye on the person for signs of rising blood sugar. Phenytoin, rifampin, and phenobarbital with risperidone may cause similar decreases in the combined plasma concentrations of risperidone and 9-hydroxyrisperidone, which could lead to decreased efficacy of risperidone treatment.