NCT06679140 · Pfizer
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
What this study is about
The purpose of the study is to evaluate whether ibuzatrelvir is effective and safe in adults and adolescents with COVID-19 who do not need to be in the hospital but who are at high risk for progression to severe disease. Eligible participants will be randomly assigned (by chance) to receive ibuzatrelvir or matching placebo taken by mouth for 5 days.
View original scientific description
The purpose of the study is to evaluate whether ibuzatrelvir is effective and safe in adults and adolescents with COVID-19 who do not need to be in the hospital but who are at high risk for progression to severe disease. Eligible participants will be randomly assigned (by chance) to receive ibuzatrelvir or matching placebo orally for 5 days. Co-administration of locally available standard of care is allowed. The total duration of the study is around 6 months.
Interventions
DRUG
ibuzatrelvir
ibuzatrelvir tablets
DRUG
placebo
placebo tablets
Primary outcome measures
Proportion of participants with COVID-19 related emergency department visits, all cause hospitalization and all cause mortality
Time frame: 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.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- 12 to \<18 years of age, weighing at least 40 kg, or ≥18 years of age of any weight at screening. 2. Presence of risk factors for progression to severe COVID-19 at the time of screening based on age: 1. 12 to 49 years of age with at least two risk factors, where one must be moderate immunocompromise; 2. 50 to 64 years of age with at least two risk factors; 3. 65 to 74 years of age with at least one risk factor; 4. For participants 75 years of age or older, there are no requirements related to risk factors. The list of risk factors includes: BMI ≥30 kg/m2; Current smoker; Chronic lung disease; Cardiovascular disease; Type 1 or Type 2 diabetes mellitus; Mild to moderate renal impairment; Neurodevelopmental disorders; Sickle cell disease; Moderate immunosuppression. 3. Confirmed SARS-CoV-2 infection as determined by RAT in nasal specimen collected within 1 day prior to randomization. Initial onset of symptoms attributable to COVID-19 within 5 d
Where
- Little Rock, Arkansas
- Bakersfield, California
- Huntington Park, California
- Inglewood, California
- Long Beach, California
- Los Alamitos, California
- Los Angeles, California
- Oxnard, California
- Redding, California
- San Diego, California
- South Gate, California
- Torrance, California
And 53 more locations — see the full list below.
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jul 9, 2026 · Source of record for eligibility and locations