RecruitingPhase 3Drug trialA Study to Evaluate the Maintenance Effect of NBI-1065845 as an Adjunctive Treatment in Participants With Major Depressive Disorder (MDD)The primary objective of this study is to evaluate the efficacy of NBI-1065845 compared with placebo as an adjunctive treatment in delaying relapse of depressive symptoms (maintenance of effect) in participants with MDD.