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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, including SARS-CoV-2 infection in adults and adolescents who are not hospitalized but at risk for severe disease, and in adults who are severely immunocompromised. It is also being studied in healthy participants for pharmacokinetic purposes.

Who makes Ibuzatrelvir?

Ibuzatrelvir is being developed by Pfizer, Inc. (NYSE: PFE). The company is conducting clinical trials to evaluate the drug's safety, tolerability, and efficacy in various populations, including healthy adults and patients with COVID-19.

What phase is Ibuzatrelvir in?

Ibuzatrelvir is in Phase 1 and Phase 3 clinical trials. Phase 1 studies are investigating how the drug is absorbed and how it interacts with other medications in healthy adults. Phase 3 studies are evaluating its efficacy and safety 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 several clinical trials, including NCT06646042 (Phase 1, drug interaction in healthy adults), NCT06679140 (Phase 3, non-hospitalized COVID-19 patients at risk for severe disease), NCT07013474 (Phase 3, severely immunocompromised adults with COVID-19), and NCT07235137 (Phase 1, pharmacokinetics in healthy Chinese adults).

Is Ibuzatrelvir FDA approved?

Ibuzatrelvir is not FDA approved. It is an investigational drug currently in clinical development. Pfizer is conducting Phase 1 and Phase 3 trials to assess its safety and efficacy for treating COVID-19, but it has not yet received regulatory approval for any use.

How does Ibuzatrelvir work?

Ibuzatrelvir is a small molecule being developed as an antiviral treatment for COVID-19. While its specific molecular target has not been disclosed in the available information, it is being studied for its ability to treat SARS-CoV-2 infection in various patient populations.