Additional Relevant Details  The randomized, double-blind, parallel-group study will characterize metabolic parameters, including insulin sensitivity and lipid metabolism, in response to treatment with ALKS 3831 and olanzapine. This exploratory metabolic study in healthy subjects is a supportive study in the ENLIGHTEN pivotal program of ALKS 3831 for the treatment of schizophrenia. The two key phase 3 studies, ENLIGHTEN-1 and ENLIGHTEN-2, have been enrolling patients since December 2015 and February 2016, respectively.The objective of the newly-initiated metabolic study is to more fully characterize the comparative metabolic effects of ALKS 3831 and olanzapine, in order to understand the potential metabolic benefits of ALKS 3831 and to build on the findings from previously conducted preclinical and clinical studies that suggest treatment with ALKS 3831 is associated with less weight gain compared to olanzapine. ALKS 3831 is designed to provide patients with the strong efficacy of olanzapine with favorable weight and metabolic properties.