I et 8- ugers placebokontrolleret forsøg med fire faste risperidondoser (2, 6, 10 og 16 mg/ dag indgivet to gange dagligt) var alle fire risperidongrupper bedre end placebo på en bedre samlet PANSS- score (Positive and Negative Syndrome Scale).
In an 8- week, placebo-controlled trial involving four fixed doses of risperidone (2, 6, 10, and 16 mg/ day, administered twice daily), all four risperidone groups were superior to placebo on the Positive and Negative Syndrome Scale (PANSS) total score.