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C5091017 - AN INTERVENTIONAL EFFICACY AND SAFETY, PHASE 3, DOUBLE-BLIND, 2 ARM STUDY TO INVESTIGATE ORALLY ADMINISTERED IBUZATRELVIR COMPARED WITH PLACEBO IN NON-HOSPITALIZED SYMPTOMATIC ADULT AND ADOLESCENT PARTICIPANTS WITH COVID-19 WHO ARE AT HIGH RISK OF PROGRESSING TO SEVERE ILLNESS

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2024-517727-39-00
Acronym
C5091017
Enrollment
541
Registered
2025-06-03
Start date
2025-07-28
Completion date
Unknown
Last updated
2025-10-20

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Covid-19 at high risk of progression to severe illness.

Brief summary

Proportion of participants with 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.

Detailed description

Time (days) to resolution of all targeted symptoms through Day 28., Proportion of participants with CRPE from Day 1 to Week 24, Proportion of participants with PACE occurring from Day 29 to Week 24, Proportion of participants with Long COVID/PASC symptoms at Week 24, based on the Long COVID/PASC PRO.

Interventions

DRUGPlacebo to Ibuzatrelvir film-coated tablet

Sponsors

Pfizer Inc.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
0 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Proportion of participants with 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.

Secondary

MeasureTime frame
Time (days) to resolution of all targeted symptoms through Day 28., Proportion of participants with CRPE from Day 1 to Week 24, Proportion of participants with PACE occurring from Day 29 to Week 24, Proportion of participants with Long COVID/PASC symptoms at Week 24, based on the Long COVID/PASC PRO.

Countries

Belgium, Bulgaria, Czechia, Denmark, Finland, Germany, Slovakia, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026