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Upamostat

Phase 2

SARS-CoV-2 | Small molecule | Infectious Disease |Redhill Biopharma Ltd.|Last Updated: Apr 17, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment92
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05954286PROTECT-APT 1: Early Treatment and Post-Exposure Prophylaxis of COVID-19PHASE2 COMPLETED 92Jan 29, 2024Apr 24, 2025Apr 17, 20266 United States, South Africa +2
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Study Endpoints
Primary Endpoints
Time to Sustained Alleviation or Resolution of COVID-19 Symptoms
Day 0 to Day 28

Defined as the number of days from randomization within a PSA to the first day the participant reports all symptoms as mild or none for at least 3 consecutive days. Symptoms will be assessed via completion of a Screening Symptom Questionnaire at Enrollment and then a Daily Follow Up Symptom Questionnaire.

Secondary Endpoints
Change in Overall COVID-19 Symptom Severity Score
Day 0 to Day 28
Time to Negative SARS-CoV-2 PCR
Day 0 to Week 12
Development of New Severe COVID-19 Symptoms
Day 0 to Week 12
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Study Design & Arms
AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION
Treatment Arms
ArmTypeDescription
Early Treatment: Upamostat 400 mgEXPERIMENTAL400 mg (2 x 200 mg) capsules administered orally once daily for 14 days
Early Treatment: Placebo Oral CapsulePLACEBO_COMPARATORThe placebo arm may be pooled across more than one experimental arm if multiple investigational drug are available to be tested at the same time and administered in the same way.
Interventions
NameTypeDescription
UpamostatDRUGUpamostat is available as a hydrogen sulphate salt (also designated as WX-671.1). WX-671.1 is a white to yellowish powder which is freely soluble in dimethyl sulfoxide and soluble in ethanol. The drug substance is very slightly soluble in water or 0.1 M HCl.
Placebo (PO)DRUGOral Capsules
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersYes
Study Sites6

Population A: Symptomatic adults seeking care or testing for COVID-19 Inclusion Criteria: 1. Age ≥ 18 years 2. Positive molecular or antigen diagnostic test for SARS-CoV-2 at study enrollment or within ≤ 5 days prior to enrollment 3. Presence of two or more Screening Symptoms listed in Supplement ...

Countries:United StatesSouth AfricaThailandUganda
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