During Phase A, tolerability to oral aripiprazole will be evaluated daily for a minimum of 3 days using safety and tolerability measures (i.e., AIMS, BARS, and SAS) in conjunction with clinical judgment. If the subject shows tolerability to the oral aripiprazole, the Phase B baseline/Day 1 should occur with the first aripiprazole once monthly injection given immediately after the Phase B baseline/Day1 assessments. If a subject is unable to tolerate oral aripiprazole during the tolerability assessment in Phase A, he or she will be withdrawn from the study.