Abstract
Excessive sleepiness (ES) is a common symptom of OSA, which often persists despite primary OSA therapy. This phase III randomized withdrawal trial evaluated solriamfetol (JZP-110) for the treatment of ES in adults with OSA. After 2weeks of clinical titration (n= 174) and 2weeks of stable dose administration (n= 148), participants who reported improvement on the Patient Global Impression of Change (PGI-C) and had numerical improvements on the Maintenance of Wakefulness Test (MWT) and Epworth Sleepiness Scale (ESS) were randomly assigned to placebo (n= 62) or solriamfetol (n= 62) for 2 additional weeks. Coprimary end points were change from weeks 4 to 6 in MWT and ESS. In the modified intention-to-treat population (n= 122), MWT mean sleep latencies and ESS scores improved from baseline to week 4 (from 12.3-13.1 to 29.0-31.7 minutes and from 15.3-16.0 to 5.9-6.4, respectively). From weeks 4 to 6, participants treated with solriamfetol maintained improvements (least squares [LS] mean [SE] changes of-1.0 [1.4] minutes on MWT and-0.1 [0.7] on ESS), whereas participants treated with placebo worsened (LS mean [SE] change of-12.1 [1.3] minutes on MWT and 4.5 [0.7] on ESS); LS mean differences between treatments were 11.2 minutes (95%CI, 7.8-14.6) and-4.6 (95%CI,-6.4 to-2.8) on MWT and ESS, respectively. Fewer participants treated with solriamfetol reported worsening on the PGI-C from weeks 4 to 6 (20%vs50%; P= .0005). Common adverse events included headache, dry mouth, nausea, dizziness, and insomnia. This study demonstrated maintenance of solriamfetol efficacy and safety over 6weeks. ClinicalTrials.gov; No.: NCT02348619; URL: www.clinicaltrials.gov; EudraCT No.: 2014-005515-16.
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