Overview Comparative Effectiveness Study for Bipolar Disorder Status: Completed Trial end date: 2013-09-01 Target enrollment: Participant gender: Summary The purpose of this study is to compare the effectiveness of lithium and quetiapine for the treatment of individuals with bipolar disorder. Phase: Phase 4 Details Lead Sponsor: Massachusetts General HospitalCollaborator: Agency for Healthcare Research and Quality (AHRQ)Treatments: Lithium CarbonateQuetiapine Fumarate