RecruitingPhase 1Drug trialA Study of the Feasibility, Safety and Tolerability of Aticaprant as Adjunctive Treatment in Participants With SchizophreniaThe purpose of this study is to see how feasible it is to enroll participants with schizophrenia and for them to complete the study/assessments. It will also assess how safe and tolerable aticaprant is when compared with placebo in participants with schizophrenia.