Extract

The purpose of this study is to evaluate the effectiveness (change in level of irritability and related behaviors) and safety and tolerability of the administration of 2 different fixed dose levels of risperidone (an atypical antipsychotic drug) compared with placebo in children or adolescents who have autism, and to evaluate the safety and tolerability of the drug for additional 26 weeks after the initial 6-week study period.

Inclusion criteria

• Autistic Disorder