NCT05438602

A Study to Learn About the Study Medicines (Nirmatrelvir Plus Ritonavir) in People Aged 12 Years or Older With COVID-19 and a Compromised Immune System

AN INTERVENTIONAL EFFICACY AND SAFETY, PHASE 2, RANDOMIZED, DOUBLE-BLIND, 3-ARM STUDY TO INVESTIGATE NIRMATRELVIR/RITONAVIR IN NONHOSPITALIZED PARTICIPANTS AT LEAST 12 YEARS OF AGE WITH SYMPTOMATIC COVID-19 WHO ARE IMMUNOCOMPROMISED

• Status: Completed
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 158 (actual)
• Sponsor: Pfizer · Industry
• Sex: All
• Age: 12 Years
• Healthy volunteers: Not accepted

Summary

The purpose of this clinical trial is to learn about the safety and effects of the study medicine (called Nirmatrelvir/Ritonavir) for the possible treatment of COVID-19. Patients with COVID-19 who have more difficulty in fighting against infections have a higher chance of severe illness. Such patients may benefit from longer treatment durations compared to the standard treatment regimen. The study is seeking participants who: * Have a confirmed COVID-19 infection * Are Immunocompromised * Experience onset of signs/symptoms attributable to the current COVID-19 infection within 5 days prior to screening and ≥1 signs/symptoms attributable to COVID-19 present on the day of randomization. In addition, this study will also evaluate the efficacy and safety of a second treatment course of nirmatrelvir/ritonavir in people who experience that their COVID-19 is flaring up within 14 days of having taken a 5-day treatment course of nirmatrelvir/ritonavir. For this group, the study is seeking participants who: * Have a confirmed COVID-19 infection * Experience a worsening of signs/symptoms after completing an initial 5-day course of nirmatrelvir/ritonavir * The worsening of COVID-19 symptoms must occur within 14 days after completion of the initial 5-day course of nirmatrelvir/ritonavir * Are Immunocompromised * Experience onset of signs/symptoms attributable to the current COVID-19 infection within 48 hours prior to screening and ≥1 signs/symptoms attributable to COVID-19 present on the day of randomization. All participants will be taking the study medicine for either 5, 10, or 15 days. The study medication will be taken by mouth 2 times a day. Participants will take part in this study for about 24 weeks. The first dose of study medication is taken at the study site and the rest at home. Selected participants will need to visit the study site at least 10 times during the study.

Conditions

• COVID-19

Interventions

Type	Name	Description
DRUG	Nirmatrelvir	Participants will receive 2 tablets of nirmatrelvir every 12 hours
DRUG	Ritonavir	Participants will receive 1 capsule of ritonavir every 12 hours
DRUG	Placebo for nirmatrelvir	Participants will receive 2 tablets of placebo for nirmatrelvir every 12 hours. A placebo does not have any medicine in it but looks just like the medicine being studied.
DRUG	Placebo for ritonavir	Participants will receive 1 capsule of placebo for ritonavir every 12 hours. A placebo does not have any medicine in it but looks just like the medicine being studied.

Timeline

• Start date: 2022-08-03
• Primary completion: 2023-07-17
• Completion: 2023-11-13
• First posted: 2022-06-30
• Last updated: 2024-09-23
• Results posted: 2024-09-23

Locations

84 sites across 9 countries: United States, Australia, Brazil, Bulgaria, Canada, Hungary, Mexico, Slovakia, Spain

Regulatory

• FDA-regulated drug study