Study to Determine the Effectiveness of Risperidone in Bipolar Disorder in Children and Adolescents

Inclusion Criteria: Current primary diagnosis of bipolar I disorder, mania or mixed type Aged between 10 and 17 years Young Mania Rating Scale score greater than or equal to 20 at screening and baseline Exclusion Criteria: Known or suspected history of substance dependence Significant risk for suicidal or violent behavior Received electroconvulsive treatment within 4 weeks of baseline Received a depot antipsychotic within 2 treatment cycle before baseline Is unable to swallow medication taken in the form of tablets Has a positive result for a urine drug screen done at baseline Known or suspected seizure disorder Hypothyroidism or hyperthyroidism, unless stabilized on appropriate medication for at least 3 months before screening Known or suspected history of hypersensitivity or intolerance to risperidone History of a poor antimanic response to risperidone when used in adequate doses for an adequate period as the sole antimanic agent