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HBS-301

Phase 3

EDS | Small molecule | Neurology |Harmony Biosciences Holdings, Inc.|Last Updated: Aug 27, 2026

Target and mechanism

ModalitySmall molecule

Also known as HBS-301 tablet

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment258

FDA Designations

No designations recorded

Clinical trial landscape

HBS-301 · 2 trials · 5 indications

Phase 3 2
NCT07675135A Phase 3 Efficacy and Safety Study of HBS-301 in Participants With NarcolepsyEDS
RECRUITING258 Analytics
NCT07500090A Phase 3 Efficacy and Safety Study of HBS-301 in Participants With Idiopathic Hypersomnia (IH)Idiopathic Hypersomnia
RECRUITING248 Analytics
PHASE3RECRUITING
A Phase 3 Efficacy and Safety Study of HBS-301 in Participants With Narcolepsy
EDSUnlock trial analytics
PHASE3RECRUITING
A Phase 3 Efficacy and Safety Study of HBS-301 in Participants With Idiopathic Hypersomnia (IH)
Idiopathic HypersomniaUnlock trial analytics

Study Endpoints

Primary Endpoints

Change in severity of EDS as measured by the Epworth Sleepiness Scale (ESS)
Baseline to end of Double-Blind Treatment Period (8 weeks)

The ESS is an 8-item, 4-point rating scale.

Secondary Endpoints

Change in Weekly Rate of Cataplexy (WRC) in participants with an average WRC of ≥3 over 2 consecutive weeks at Screening
End of the Double-Blind Treatment Period (8 weeks)
Change in sleepiness/wakefulness measured by the Maintenance of Wakefulness Test (MWT)
Baseline to the end of the Double-blind Treatment Period (8 weeks)
Change in fatigue as measured by the Patient-Reported Outcomes Measurement Information System Fatigue Short Form 7a (PROMIS-Fatigue-SF-7a)
Baseline to end of Double-Blind Treatment Period (8 weeks)
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Double-Blind Treatment Period HBS-301EXPERIMENTALHBS-301 tablets administered once daily in the morning upon wakening
Double-blind Treatment Period PlaceboPLACEBO_COMPARATORMatching placebo tablets administered once daily in the morning upon wakening
Open-Label Extension Period HBS-301EXPERIMENTALHBS-301 tablets administered once daily in the morning upon wakening

Interventions

NameTypeDescription
HBS-301DRUGHBS-301 tablet
PlaceboOTHERPlacebo tablet
HBS-301 tabletDRUGHBS-301 tablet
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites53

Inclusion Criteria: * Has a current documented diagnosis of NT1 or NT2 per the International Classification of Sleep Disorders, Third Edition (ICSD-3) or the ICSD-3 Text Revision (ICSD-3-TR) within the last 10 years. * Has EDS. * If taking a permitted chronic concomitant medication or supplement, i...

Countries:United StatesCanada
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Recent Changes (Last 90 Days)

LOWAug 27, 2026NCT07675135lastUpdatePostDate: changed
LOWAug 27, 2026NCT07675135lastUpdatePostDate: changed
LOWAug 14, 2026NCT07500090lastUpdatePostDate: changed
LOWAug 14, 2026NCT07500090lastUpdatePostDate: changed
LOWAug 14, 2026NCT07500090lastUpdatePostDate: changed
LOWAug 12, 2026NCT07675135lastUpdatePostDate: changed
LOWAug 12, 2026NCT07675135lastUpdatePostDate: changed
LOWJul 2, 2026NCT07500090lastUpdatePostDate: changed
LOWJul 2, 2026NCT07500090lastUpdatePostDate: changed
LOWJul 2, 2026NCT07500090lastUpdatePostDate: changed
LOWJun 30, 2026NCT07675135NEW_TRIAL: changed
LOWJun 30, 2026NCT07675135NEW_TRIAL: changed
LOWJun 30, 2026NCT07675135NEW_TRIAL: changed

Frequently asked questions about HBS-301

What is HBS-301 used for?

HBS-301 is an investigational small molecule being developed for excessive daytime sleepiness (EDS) and idiopathic hypersomnia. It is also being studied in narcolepsy, including symptoms of cataplexy and fatigue. The drug is in Phase 3 clinical development and is not yet approved by the FDA.

What does HBS-301 target?

HBS-301 is a small molecule in development for neurological sleep disorders. Its specific molecular target has not been disclosed in available information. The drug is being evaluated for its effects on excessive daytime sleepiness and idiopathic hypersomnia in clinical trials.

Who makes HBS-301?

HBS-301 is being developed by Harmony Biosciences Holdings, Inc., a biopharmaceutical company traded on NASDAQ under the ticker HRMY. The company is conducting Phase 3 clinical trials for the drug in the United States and Canada.

What phase is HBS-301 in?

HBS-301 is currently in Phase 3 clinical development. It is an investigational drug and has not received FDA approval. Two Phase 3 trials are actively recruiting participants to evaluate its efficacy and safety in idiopathic hypersomnia and narcolepsy.

What clinical trials is HBS-301 in?

HBS-301 is being studied in two Phase 3 trials. NCT07500090 is evaluating the drug in 248 participants with idiopathic hypersomnia in the United States. NCT07675135 is studying 258 participants with narcolepsy in the United States and Canada. Both trials are randomized, double-blind, and placebo-controlled.

Is HBS-301 the same as HBS-301 tablet?

Yes, HBS-301 is also known as HBS-301 tablet. The drug is an oral small molecule being developed by Harmony Biosciences for the treatment of excessive daytime sleepiness and idiopathic hypersomnia. It is currently in Phase 3 clinical trials.