Alkermes plc (ALKS) announced the initiation of the phase II Vibrance-2 study, evaluating its novel, investigational, oral orexin 2 receptor agonist ALKS 2680 in adults with narcolepsy type 2 (NT2).The double-blind, placebo-controlled study will evaluate the safety and efficacy of ALKS 2680 as compared to placebo in adults with NT2. The primary endpoint of the Vibrance-2 study will check whether treatment with ALKS 2680 leads to a greater decrease in sleepiness versus placebo, as measured by the change in m ...