Alkermes plc announced positive topline results from ENLIGHTEN-Early, a phase 3b study that evaluated the effect of LYBALVI® (olanzapine and samidorphan) compared to olanzapine on body weight in young adult patients (ages 16 to 39; mean age: 26 years) with schizophrenia, schizophreniform disorder or bipolar I disorder who were early in their illness. The study met its pre-specified primary endpoint, as patients treated with LYBALVI experienced statistically significantly less weight gain than patients treated with olanzapine at Week 12.