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EPX-100

Phase 1

Drug Drug Interaction | Small molecule | Other |Harmony Biosciences Holdings, Inc.|Last Updated: Sep 17, 2026

Development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Sep 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials1
Total Enrollment54

FDA Designations

No designations recorded

Clinical trial landscape

EPX-100 · 1 trial · 1 indication

Phase 1 1
NCT07824193Drug-drug Interaction Study of Clemizole (EPX-100) in Healthy ParticipantsDrug Drug Interaction
COMPLETED54 Analytics
PHASE1COMPLETED
Drug-drug Interaction Study of Clemizole (EPX-100) in Healthy Participants
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Study Endpoints

Primary Endpoints

Area Under The Concentration-time Curve (AUC), from Time 0 to the Last Observed Non-zero Concentration (AUC0-t) Of EPX-100
Up to Day 15
AUC From Time 0 extrapolated to infinity (AUC0-inf) of EPX-100
Up to Day 15
Maximum Observed Concentration (Cmax) of EPX-100
Up to Day 15
AUC0-t of Omeprazole
Up to Day 15
AUC0-inf of Omeprazole
Up to Day 15
Cmax of Omeprazole
Up to Day 15
AUC0-t of Midazolam
Up to Day 15
AUC0-inf of Midazolam
Up to Day 15
Cmax of Midazolam
Up to Day 15
AUC0-t of Bupropion
Up to Day 19
AUC0-inf of Bupropion
Up to Day 19
Cmax of Bupropion
Up to Day 19

Secondary Endpoints

Number of Participants with Treatment Emergent Adverse Events
Up to 12 Weeks
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeBASIC_SCIENCE

Treatment Arms

ArmTypeDescription
Part 1 - ItraconazoleEXPERIMENTALTreatment A (Period 1): EPX-100 on Day 1. Treatment B (Period 2): itraconazole twice daily (BID) on Day 1; then once daily (QD) on Days 2-5, with EPX-100 administered approximately 2 hours after itraconazole dosing on Day 5.
Part 2 - PhenytoinEXPERIMENTALTreatment C (Period 1): EPX-100 on Day 1. Treatment D (Period 2): phenytoin three times daily (TID) on Days 1 to Day 14, with EPX-100 coadministered on the morning of Day 14.
Part 3 - Omeprazole, Midazolam, and BupropionEXPERIMENTALTreatment E (Period 1): omeprazole on Day 1; midazolam on Day 2; bupropion on Day 3. Treatment F (Period 2): EPX-100 BID on Days 1-18 with omeprazole coadministered on the morning of Day 12; midazolam coadministered on the morning of Day 14; bupropion coadministered on the morning of Day 15.

Interventions

NameTypeDescription
EPX-100DRUGOral solution
ItraconazoleDRUGOral solution
PhenytoinDRUGPhenytoin sodium extended-release capsules
OmeprazoleDRUGDelayed-release capsule
MidazolamDRUGMidazolam hydrochloride (HCl) syrup
BupropionDRUGBupropion HCl tablets
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Healthy, adult, male or female, 18-55 years of age, inclusive, at the screening visit * Continuous non-smoker who has not used nicotine- and tobacco-containing products for at least 3 months prior to the first dosing. * Body mass index ≥18.0 and ≤32.0 kilograms per square mete...

Countries:United States
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