A Study of Aticaprant 10 mg as Adjunctive Therapy in Adult Participants With Major Depressive Disorder (MDD) With Moderate-to-severe Anhedonia and Inadequate Response to Current Antidepressant Therapy and Long-term Extension Treatment With Aticaprant

The purpose of this study is to evaluate how well aticaprant works as compared with placebo when given along with an antidepressant therapy in improving the depressive symptoms in adult participants with major depressive disorder (MDD) with moderate to severe anhedonia (ANH+) who have not responded well to current antidepressant therapy with a selective serotonin reuptake inhibitor/serotonin-norepinephrine reuptake inhibitor (SSRI or SNRI).