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ibuzatrelvir

Phase 3

COVID-19 Infection | Small molecule | Infectious Disease |Pfizer, Inc.|Last Updated: Jul 9, 2026

Success Probability
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Market & Valuation
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Trial Design
RandomizedDouble-BlindCONTROLLEDDMC
Total Trials1
Total Enrollment300
FDA Designations
No designations recorded
Clinical trial landscape

ibuzatrelvir · 4 trials · 4 indications

Phase 3 2Phase 1 2
NCT07013474A Study to Learn About the Study Medicine Ibuzatrelvir in Adults With COVID-19 Who Are Severely ImmunocompromisedCOVID-19 Infection
RECRUITING300 Analytics
NCT06679140A Study to Learn About a Study Medicine Called Ibuzatrelvir in Adult and Adolescent Patients With COVID-19 Who Are Not Hospitalized But Are at Risk For Severe DiseaseCOVID-19 SARS-CoV-2 Infection
RECRUITING2,330 Analytics
PHASE3RECRUITING
A Study to Learn About the Study Medicine Ibuzatrelvir in Adults With COVID-19 Who Are Severely Immunocompromised
COVID-19 InfectionUnlock trial analytics
PHASE3RECRUITING
A Study to Learn About a Study Medicine Called Ibuzatrelvir in Adult and Adolescent Patients With COVID-19 Who Are Not Hospitalized But Are at Risk For Severe Disease
COVID-19 SARS-CoV-2 InfectionUnlock trial analytics
Study Endpoints
Primary Endpoints
The difference in the proportion of patients meeting the primary composite endpoint, between ibuzatrelvir and remdesivir vs remdesivir groups in symptomatic adult participants with COVID-19 who are severely immunocompromised
38 days

The difference in the proportion of participants with the composite endpoint of a) COVID-19-related ED visits with administration of supplemental oxygen, COVID-19 antiviral, or IV treatment; COVID-19-related hospitalization; or all-cause mortality, and b) Evidence of recurrent or persistent SARS-CoV-2 infection

Proportion of participants with COVID-19 related emergency department visits, all cause hospitalization and all cause mortality
Day 1 through Day 28

The difference in proportions of patients requiring COVID 19 related emergency department visits with administration of supplemental oxygen, COVID-19 antiviral or IV treatment (eg hydration, antibiotics, or corticosteroids), all-cause hospitalization, or all-cause death through Day 28 between ibuzatrelvir and placebo, among patients who were treated ≤5 days after COVID-19 symptom onset and who were not receiving background SoC treatment for their COVID-19 infection at baseline.

Maximum Observed Plasma Concentration (Cmax)
up to Day 3
AUCinf
up to Day 3
Terminal phase half-life (t½)
up to Day 3
Maximum Observed Plasma Concentration (Cmax) of ibuzatrelvir
Hour 0, 0.5, 1, 2, 4, 6, 8, 12, 24, 36, 48 post-dose in each period
Area Under the Curve From Time Zero to Extrapolated Infinite Time (AUCinf) of ibuzatrelvir
Hour 0, 0.5, 1, 2, 4, 6, 8, 12, 24, 36, 48 post-dose in each period

if data permits

Area under the plasma concentration-time curve from time 0 to the time of the last quantifiable concentration (AUClast) ofibuzatrelvir
Hour 0, 0.5, 1, 2, 4, 6, 8, 12, 24, 36, 48 post-dose in each period
Secondary Endpoints
Time to sustained alleviation of all targeted COVID-19 symptoms
38 days
Proportion of participants with evidence of recurrent or persistent SARS-CoV-2 infection.
38 days
Proportion of participants with COVID-19-related ED visits with administration of supplemental oxygen, COVID-19 antiviral, or IV treatment, COVID-19-related hospitalization, or all-cause mortality.
38 days
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Study Design & Arms
AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
IbuzatrelvirEXPERIMENTALParticipants will receive ibuzatrelvir orally twice a day + IV placebo for remdesivir
Ibuzatrelvir + RemdesivirEXPERIMENTALParticipants will receive ibuzatrelvir orally twice a day + IV remdesivir
RemdesivirEXPERIMENTALParticipants will receive placebo for ibuzatrelvir orally twice a day + IV remdesivir
placeboPLACEBO_COMPARATORplacebo administered orally every 12 hours (twice daily) for 5 days.
Period 1EXPERIMENTALibuzatrelvir single oral dose on Day 1.
Period 2EXPERIMENTALcarbamazepine BID oral doses on Day 1-15. ibuzatrelvir single oral dose on Day 14.
Interventions
NameTypeDescription
ibuzatrelvirDRUGtablet
remdesivirDRUGinjection, for intravenous use
placebo for ibuzatrelvirDRUGtablet
placebo for remdesivirDRUGinjection, for intravenous use
placeboDRUGplacebo tablets
carbamazepine ERDRUG100 mg BID (Day 1-3) 200 mg BID (Day 4-7) 300 mg BID (Day 8-15)
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Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites148

Inclusion Criteria: 1. 18 years of age or older at screening who are non-hospitalized or hospitalized for observation or with the intent of administering the study intervention. 2. Confirmed SARS-CoV-2 infection as determined by RAT (or other locally approved test) collected within 2 days prior to ...

Countries:United StatesArgentinaBelgiumBrazilDenmarkFranceGermanyGreeceJapanMexicoNetherlandsPuerto RicoSlovakiaSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)BulgariaCanadaChinaCzechiaFinlandSouth Africa
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Recent Changes (Last 90 Days)
LOWJul 9, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 9, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 9, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 9, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 2, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 2, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 2, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 2, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 2, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 2, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 2, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 2, 2026NCT07013474lastUpdatePostDate: changed
LOWJun 16, 2026NCT06679140lastUpdatePostDate: changed
LOWJun 16, 2026NCT07013474lastUpdatePostDate: changed
LOWJun 16, 2026NCT06679140lastUpdatePostDate: changed
LOWJun 16, 2026NCT07013474lastUpdatePostDate: changed
LOWJun 16, 2026NCT06679140lastUpdatePostDate: changed
LOWJun 16, 2026NCT07013474lastUpdatePostDate: changed
LOWJun 5, 2026NCT06679140lastUpdatePostDate: changed
LOWJun 5, 2026NCT07013474lastUpdatePostDate: changed