Alkermes plc’s placebo-controlled phase II study of alixorexton in treating narcolepsy type 2 (NT2) hit its dual primary endpoints, producing statistically significant and clinically meaningful improvement in wakefulness and excessive daytime sleepiness. Alkermes said alixorexton is the first oral orexin 2 receptor agonist that has shown efficacy in a large phase II clinical trial in those with NT2.