Efficacy & Safety Study of Oral Aripiprazole in Adolescents With Schizophrenia

Inclusion Criteria: * Subjects with a current DSM-IV-TR diagnosis of schizophrenia, and a history of the illness (diagnosis or symptoms) for at least 6 months prior to screening. * Subjects who have shown previous response to antipsychotic treatment (other than clozapine) and are not resistant to treatment with other antipsychotics. * Subjects who are currently being treated with oral or depot antipsychotics other than clozapine. * Subjects with a history of relapse and/or exacerbation of symptoms when they are not receiving antipsychotic treatment. Exclusion Criteria: * Subjects with a current DSM-IV-TR diagnosis other than schizophrenia. * Subjects with delirium, dementia, amnesia or other cognitive disorders; subjects with psychotic symptoms that are better accounted for by another general medical condition(s) or direct effect of a substance (i.e., medication, illicit drug use, etc.). * Subjects with attention deficit disorder or attention deficit hyperactivity disorder and/or subjects who were on a stimulant treatment for any period of time over the last one year prior to screening. * Subjects with any neurodevelopmental disorder, except Tourette's syndrome. * Subjects experiencing acute depressive symptoms within the past 30 days prior to screening. * Subjects who meet the DSM-IV-TR criteria for substance dependence (including alcohol and benzodiazepines, but excluding caffeine and nicotine) within the past 180 days prior to screening. * Subjects who have epilepsy, a history of seizures (except for a single childhood febrile seizure or post-traumatic seizure), or a history of severe head trauma or stroke, or have a history or current evidence of other unstable medical conditions. * Subjects with a history of subclinical hypothyroidism (TSH ≥ 4.0 mIU/L), known hypothyroidism or hyperthyroidism (unless the condition has been stabilized with medication for at least 90 days prior to entry into Phase 1 or Phase 2). * Subjects who have a medical history of uncontrolled diabetes, labile or unstable diabetes (brittle diabetes), newly diagnosed diabetes, or clinically significant abnormal blood glucose levels.