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zelicapavir

Phase 2

RSV Infection | Small molecule | Infectious Disease |Enanta Pharmaceuticals, Inc.|Last Updated: Mar 19, 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 Trials2
Total Enrollment222
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07482657A Phase 2 Study to Investigate the Efficacy and Safety of Zelicapavir in Participants Aged ≥28 Days to ≤36 Months of Age Infected With Respiratory Syncytial VirusPHASE2 NOT YET_RECRUITING 150Jul 1, 2026Dec 1, 2026Mar 19, 2026 -
NCT06601192A Study to Investigate the Effects of Zelicapavir (EDP-938) on QTc Interval in Healthy AdultsPHASE1 COMPLETED 72Jul 15, 2024Feb 25, 2025Jul 28, 20252 United States
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Study Endpoints
Primary Endpoints
Time to complete resolution of clinical signs of RSV as measured by RESOLVE-P
Day 1 through Day 14
Time-matched, placebo-corrected change-from-baseline QTc based on the Fridericia correction QTcF (ΔΔQTcF) after TD and SD of Zelicapavir
Up to 24 hours post dose
Secondary Endpoints
Time to sustained resolution of clinical signs of RSV as measured by RESOLVE-P
Day 1 through Day 14
Change in severity of clinical signs of RSV from Baseline to D7 as measured by RESOLVE-P
Day 1 through Day 7
Proportion of participants with Lower Respiratory Tract Infection (LRTI)
D1 through D14
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Study Design & Arms
AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
zelicapavirEXPERIMENTALzelicapavir, oral suspension, once daily for 7 days
PlaceboPLACEBO_COMPARATORMatching placebo, orally, once daily for 7 days
zelicapavir Dose 1 (therapeutic dose)EXPERIMENTALAll participants will receive 4 study interventions. The study interventions will be administered during separate treatment periods starting on Days 1, 9, 17, and 25.
zelicapavir Dose 2 (supratherapeutic dose)EXPERIMENTALAll participants will receive 4 study interventions. The study interventions will be administered during separate treatment periods starting on Days 1, 9, 17, and 25.
moxifloxacinEXPERIMENTALAll participants will receive 4 study interventions. The study interventions will be administered during separate treatment periods starting on Days 1, 9, 17, and 25.
Interventions
NameTypeDescription
zelicapavirDRUGOral suspension
PlaceboDRUGPlacebo oral suspension to match zelicapavir
zelicapavir (therapeutic dose)DRUGSubjects will receive zelicapavir (TD) once per treatment period.
zelicapavir (supratherapeutic dose)DRUGSubjects will receive zelicapavir (SD) once per treatment period.
moxifloxacinDRUGSubjects will receive moxifloxin once per treatment period.
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Eligibility Criteria
Age Range28 Days — 36 Months
SexALL
Healthy VolunteersNo

Inclusion Criteria: * Participants diagnosed with RSV infection using an approved diagnostic assay, without known and/or documented coinfection with SARS-CoV-2 or influenza * Participant has signs of RSV infection with onset ≤3 days (72 hours) at the time of randomization * In the Investigator's op...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07482657primaryCompletionDate: changed
LOWMay 24, 2026NCT07482657studyFirstPostDate: changed