Patients with other psychotic disorders.

Patients whose condition is due to the direct physiological effects of a substances (e.g., drug abuse) or a general medical condition.

Patients with a history of autistic disorder or another pervasive developmental disorder.

Patients with epilepsy or a history of seizures requiring treatment.

Patients who are excluded from taking the drug risperidone.

Patients who pose a current serious suicidal or homicidal risk.

Patients who are adequately stabilized on their treatment.

Schizophrenia Study In Adults