A Study to Learn How Paxlovid [Nirmatrelvir-ritonavir/PF-07321332] Works in COVID-19 Patients Who Are Elderly or Have Medical Conditions.
← catalyst calendarSponsored by Pfizer (industry) · PFE — their whole pipeline →.
Phase
—
Status
Completed
Study type
Observational
Enrollment
99,000actual
Sites
1
Country
United States
Every value on this page is a field the sponsor filed with ClinicalTrials.gov, reproduced. Dates are their own estimates, revised as a study runs, unless the registry marks them actual. sources →
Source: ClinicalTrials.gov, retrieved 2026-08-19
Dates
each axis at the precision it was filed, with the registry's own basis| Date | Filed | Basis | What it is |
|---|---|---|---|
| Start | 2025-10-27 | actual | When the study began enrolling |
| Primary completion | 2026-02-26 | actual | The date the last participant is measured for the primary outcome — the readout window |
| Study completion | 2026-02-26 | actual | The whole study's end, after follow-up |
| First posted | 2025-12-03 | actual | When this record first appeared on the registry |
| Results posted | — | When the sponsor posted results to the registry | |
| Record updated | 2026-06-29 | actual | The sponsor's own last edit to this record — every projection above is as current as this date |
What it studies
Condition
- COVID-19
Interventions
- Drug: nirmatrelvir-ritonavir — also filed as paxlovid
- Other: No treatment
Primary outcome
what the primary-completion date above is the date OFTime to the first severe composite outcome (all-cause hospital admission, ICU admission, or death) within 30 days of treatment assessment.
measured Participants selected between 01 Dec, 2022 to 31 March 2024
Permalink · PFE's whole pipeline · Catalyst calendar · Every registered study · What changed