A Placebo Controlled Study For Patients With Schizophrenia

Inclusion Criteria:

• Patient must meet diagnostic criteria for schizophrenia.

Exclusion Criteria:

• 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.