I et 6- ugers placebokontrolleret forsøg med titrering af risperidon i doser op til 10 mg/ dag indgivet to gange dagligt var risperidon bedre end placebo på en samlet BPRS- score (Brief Psychiatric Rating Scale).
In a 6- week, placebo-controlled trial involving titration of risperidone in doses up to 10 mg/ day administered twice daily, risperidone was superior to placebo on the Brief Psychiatric Rating Scale (BPRS) total score.