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ibuzatrelvir

Phase 3

COVID-19 Infection | Small molecule | Infectious Disease |Pfizer, Inc.|Last Updated: Aug 25, 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) Progression to severe COVID-19 or all-cause mortality by Day 38, or 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 medical intervention, COVID-19-related hospitalization, or all-cause mortality.
38 days
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Ibuzatrelvir + RemdesivirEXPERIMENTALParticipants will receive ibuzatrelvir orally twice a day + IV remdesivir
IbuzatrelvirEXPERIMENTALParticipants will receive ibuzatrelvir orally twice a day + IV placebo for 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 Sites152

Inclusion Criteria: 1. 18 years of age or older at screening who are non-hospitalized or hospitalized with mild to moderate COVID-19 2. Confirmed SARS-CoV-2 infection as determined by RAT (or other locally approved test) collected within 2 days prior to randomization. Initial onset of symptoms attr...

Countries:United StatesArgentinaBelgiumBrazilDenmarkFranceGermanyGreeceJapanMexicoNetherlandsPuerto RicoSlovakiaSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)BulgariaCanadaChinaCzechiaFinlandSouth Africa
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Recent Changes (Last 90 Days)

LOWAug 25, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 25, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 24, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 24, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 14, 2026NCT06679140lastUpdatePostDate: changed
LOWAug 14, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 14, 2026NCT06679140lastUpdatePostDate: changed
LOWAug 14, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 11, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 11, 2026NCT07013474lastUpdatePostDate: changed
LOWAug 11, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 31, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 31, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 30, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 30, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 9, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 9, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 9, 2026NCT06679140lastUpdatePostDate: changed
LOWJul 9, 2026NCT07013474lastUpdatePostDate: changed
LOWJul 2, 2026NCT06679140lastUpdatePostDate: changed

Frequently asked questions about ibuzatrelvir

What is Ibuzatrelvir used for?

Ibuzatrelvir is an investigational small molecule being studied for the treatment of COVID-19 infection, including COVID-19 SARS-CoV-2 infection. It is being evaluated in adult and adolescent patients who are not hospitalized but are at risk for severe disease, as well as in adults who are severely immunocompromised.

Who makes Ibuzatrelvir?

Ibuzatrelvir is being developed by Pfizer, Inc. (NYSE: PFE). The company is conducting clinical trials to evaluate the drug's safety and efficacy in treating COVID-19 infection.

What phase is Ibuzatrelvir in?

Ibuzatrelvir is in Phase 1 and Phase 3 clinical trials. Phase 1 studies are investigating how the drug is processed in healthy adults, while Phase 3 studies are evaluating its efficacy in patients with COVID-19 who are at risk for severe disease or are severely immunocompromised.

What clinical trials is Ibuzatrelvir in?

Ibuzatrelvir is being studied in four clinical trials. NCT06646042 and NCT07235137 are Phase 1 studies in healthy adults, including a study in Chinese participants. NCT06679140 is a Phase 3 trial in non-hospitalized COVID-19 patients at risk for severe disease, and NCT07013474 is a Phase 3 trial in severely immunocompromised adults with COVID-19.

Is Ibuzatrelvir FDA approved?

Ibuzatrelvir is not FDA approved. It is an investigational drug currently in clinical development, with ongoing Phase 3 trials for COVID-19. The drug has not completed the regulatory approval process.

How does Ibuzatrelvir work?

Ibuzatrelvir is a small molecule being studied for COVID-19. Its specific molecular target has not been disclosed in the available clinical trial information. The drug is being evaluated for its ability to treat COVID-19 infection in various patient populations.