Phase 3 Study of HBS-301 for Treating Idiopathic Hypersomnia in Adults with an Optional One-Year Extension

What this Trial Is About

Researchers are evaluating the efficacy and safety of HBS-301 in adults aged 18 years and older who have idiopathic hypersomnia IH, a condition marked by excessive daytime sleepiness EDS. This Phase 3, multicenter, randomized, double-blind, placebo-controlled study aims to better understand how HBS-301 affects symptoms of IH including sleep inertia, fatigue, and cognitive complaints. Participants will be assigned to receive either HBS-301 tablets or matching placebo tablets once daily in the morning upon waking during an 8-week double-blind treatment period. Following this, there is an optional one-year open-label extension where all participants may receive HBS-301. The study begins with a screeningbaseline period lasting up to 28 days and concludes with 30 days of safety follow-up after treatment. During the trial, participants will undergo various assessments including the Epworth Sleepiness Scale to measure daytime sleepiness, the Idiopathic Hypersomnia Severity Scale, Sleep Inertia Questionnaire, and other patient-reported outcome measures. Researchers will monitor changes in fatigue, cognitive function, quality of life, work productivity, and side effects throughout the study and extension period. Total participation may last up to about 16 months including safety follow-up.

A Phase 3 Efficacy and Safety Study of HBS-301 in Participants With Idiopathic Hypersomnia (IH)