Nov 14 2025
Alkermes Announces Positive Topline Results From Vibrance-2 Phase 2 Study of Once-Daily Alixorexton in Patients With Narcolepsy Type 2

DUBLIN, Nov. 12, 2025 /PRNewswire/ — Alkermes plc (Nasdaq: ALKS) today announced positive topline results from the Vibrance-2 dose-ranging phase 2 study evaluating alixorexton in patients with narcolepsy type 2 (NT2). Alixorexton, formerly referred to as ALKS 2680, is the company’s novel, investigational, oral, selective orexin 2 receptor (OX2R) agonist in phase 2 development for the treatment of narcolepsy type 1 (NT1), NT2 and idiopathic hypersomnia (IH). In Vibrance-2, once-daily alixorexton met the dual primary endpoints, demonstrating statistically significant and clinically meaningful improvements from baseline compared to placebo on the Maintenance of Wakefulness Test (MWT) and Epworth Sleepiness Scale (ESS) at week eight. Alixorexton was generally well tolerated at all doses tested. Results from Vibrance-2 and the previously announced Vibrance-1 phase 2 study in patients with NT1 support rapid initiation of a global phase 3 program of alixorexton in patients with NT1 and NT2.

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