Intramuscular Depot Formulation of Aripiprazole as Maintenance Treatment in Patients With Schizophrenia

Inclusion Criteria: * Subjects who are able to provide written informed consent and/or consent obtained from a legally acceptable representative (as required by Institutional Review Board/Independent Ethics Committee \[IRB/IEC\]), prior to the initiation of any protocol-required procedures. * Male and female subjects 18 to 60 years of age, inclusive, at time of informed consent. * Subjects with a current diagnosis of schizophrenia as defined by Diagnostic and Statistical Manual of Mental Disorders, version 4, Text Revision (DSM-IV-TR) criteria and a history of the illness for at least 3 years prior to screening. * Subjects who, in the investigator's judgment, require chronic treatment with an anti-psychotic medication. * Subjects able to understand the nature of the study and follow protocol requirements, including the prescribed dosage regimens, tablet ingestion, IM depot injection, discontinuation of prohibited concomitant medications, who can read and understand the written word in order to complete patient-reported outcome measures, and who can be reliably rated on assessment scales. Exclusion Criteria: * Subjects with a current DSM-IV-TR diagnosis other than schizophrenia, including schizoaffective disorder, major depressive disorder, bipolar disorder, delirium, dementia, amnestic, or other cognitive disorders. Also, subjects with borderline, paranoid, histrionic, schizotypal, schizoid, or antisocial personality disorder. * Subjects with schizophrenia that are considered resistant/refractory to antipsychotic treatment by history or response only to clozapine. * Subjects with a significant risk of violent behavior or a significant risk of committing suicide based on history or investigator's judgment. * Subjects who currently meet DSM-IV-TR criteria for substance dependence; including alcohol and benzodiazepines, but excluding caffeine and nicotine, or 2 positive drug screens for cocaine. * Subjects who are known to be allergic, intolerant, or unresponsive to prior treatment with aripiprazole or other quinolinones, or hypersensitivity to anti-psychotic agents, including aripiprazole. * Subjects with a history of neuroleptic malignant syndrome or clinically significant tardive dyskinesia at screening. * Subjects with uncontrolled thyroid function abnormalities. * Subjects with a history of seizures, neuroleptic malignant syndrome, clinically significant tardive dyskinesia, or other medical condition that would expose the subject to undue risk or interfere with study assessments. * Subjects who are involuntarily incarcerated. * Subjects who have undergone electroconvulsive therapy within 180 days of entry into Phase 2. * Subjects who have used an investigational agent within 30 days of screening; and prior participation in a clinical study with aripiprazole IM depot. * Subjects with clinically significant abnormalities in laboratory test results, vital signs, or ECG results. * Subjects hospitalized for more than 30 days in the 90 days prior to Phase 1 (or Phase 2 for subjects bypassing Phase 1). * Subjects requiring more than 1 benzodiazepine beyond screening (eg, lorazepam and oxazepam). * Subjects who fail to wash-out from prohibited concomitant medications, including the use of CYP2D6 or CYP3A4 inhibitors or CYP3A4 inducers, antipsychotics, antidepressants (including monoamine oxidase inhibitors \[MAOI\]), and mood stabilizers, during screening and Phase 1.