Nirmatrelvir/ritonavir is named as an intervention in 4 current clinical trials in our Canada, Ireland, India, Germany, France, Spain, Italy, Netherlands, Belgium, Switzerland, Czechia, Portugal, Japan, Australia, Israel, Norway and Brazil registers. 3 are recruiting patients now. The most common phase is Phase 3. The sponsor with the most trials is UMC Utrecht (1). The most-studied condition is COVID-19.
Registers list studies that are recruiting, about to open, active but closed to enrolment, or enrolling by invitation. The UK and USA registers cover industry-sponsored studies only. Trial titles and statuses are copied from the registry as published.
| Lead sponsor | Trials |
|---|---|
| UMC Utrecht | 1 |
| Haukeland University Hospital | 1 |
| Mount Sinai Hospital, Canada | 1 |
| University of Oxford | 1 |
A trial with sites in more than one country appears in each of those registers.
4 current trials in our Canada, Ireland, India, Germany, France, Spain, Italy, Netherlands, Belgium, Switzerland, Czechia, Portugal, Japan, Australia, Israel, Norway and Brazil registers name Nirmatrelvir/ritonavir as a drug or biological intervention, as of the registry sync on 28 September 2026. Completed and withdrawn studies are not counted.
Yes. 3 of the 4 trials are recruiting: 2 with sites in Canada, 1 with sites in Ireland, 1 with sites in India, 1 with sites in Germany, 1 with sites in France, 1 with sites in Spain, 1 with sites in Italy, 1 with sites in Netherlands, 1 with sites in Belgium, 1 with sites in Switzerland, 1 with sites in Czechia, 1 with sites in Portugal, 1 with sites in Japan, 1 with sites in Australia, 1 with sites in Israel and 1 with sites in Brazil. Eligibility and site contacts are on each trial's record. Only the study team can confirm whether a patient is eligible.
UMC Utrecht (1), Haukeland University Hospital (1), Mount Sinai Hospital, Canada (1) and University of Oxford (1). The number in brackets is how many trials each organisation leads.
Yes. 1 trial in our Ireland register (ClinicalTrials.gov). Some may be the same study registered in both. See the Irish clinical trials register for sites and contacts.
Every trial, status, phase and sponsor on this page is copied from public ClinicalTrials.gov records by a daily sync. Nothing here describes how Nirmatrelvir/ritonavir works or whether it is effective, and it is not medical advice.
Everything on this page is copied from public ClinicalTrials.gov registry records — it is not written from memory, and nothing here describes how Nirmatrelvir/ritonavir works or whether it is effective. Each trial links to its own record so you can check it yourself.
This page is built automatically: a daily sync job reads the registry records behind our country trial registers, collects every trial that lists Nirmatrelvir/ritonavir (or a registered synonym) as a drug or biological intervention, and tabulates the registry fields directly. Placebos and generic comparators are excluded. There is no AI drafting and no per-compound editorial pass, and the page has not been clinically reviewed. The “last verified” date above is the timestamp of that sync, not a review date. Our general editorial approach is described in our editorial standards and corrections policy. The ClinicalTrials.gov data on this page was last retrieved on 28 Sep 2026.