Pfizer tests new pill form in healthy volunteers to see how food and acid reducers affect drug levels
NCT ID NCT07563894
First seen Jun 25, 2026 · Last updated Jul 10, 2026 · Updated 3 times
Summary
This early-stage study in 16 healthy adults aims to compare how well a new film-coated tablet of the experimental drug PF-07799933 is absorbed versus an older tablet form. It also checks whether taking the drug with a high-fat meal or with an acid-reducing medication changes drug levels in the blood. The results will guide how the drug should be taken in future clinical trials.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- PF-07799933 and PF-07799544 (investigational drugs)
- What this could lead to
- If successful, this study will help determine the best way to take these drugs in future trials, potentially leading to more effective dosing instructions.
- What could go wrong
- This is a very early Phase 1 study in only 16 healthy people, not patients. It only measures drug levels in the blood, not whether the drugs work for any disease. Results may not apply to sick patients.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
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16 people
The number who actually took part.
- Started
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Apr 2026
- Finished
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Jun 2026
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria * Female participants of non-childbearing potential and male participants 18 to 65 years of age (or the minimum age of consent in accordance with local regulations) at screening who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, vital signs and ECGs. * BMI of 16-32 kg/m2; and a total body weight \>50 kg (110 lb) Exclusion Criteria * Evidence or history of clinically significant uveitis, hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing). * Any condition possibly affecting drug absorption (eg, gastrectomy, cholecystectomy, chronic diarrhea, - inflammatory bowel disease). * History of HIV infection, hepatitis B, or hepatitis C * History or current evidence of retinal vein occlusion (RVO) or current risk factors for RVO (eg,glaucoma or ocular hypertension, history of hyperviscosity or hypercoagulability syndromes); history of retinal degenerative disease (including evidence of macular degeneration); blurred vision. * Any evidence of active bacterial, fungal, or viral infection * Participants who have undergone major surgery ≤ 2 weeks prior to starting study treatment * Participants with known or suspected hypersensitivity to active ingredient/excipients * Any medical or psychiatric condition including any active suicidal ideation in the past year or suicidal behavior in the past 5 years or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study. * Use of prescription or nonprescription drugs and dietary and herbal supplements within 7 days or 5 half lives (whichever is longer) prior to the first dose of study intervention. Prior or concomitant use of proton pump inhibitors within 7 days prior to first dose of study intervention is prohibited. Also prohibited is prior or concomitant use of any medications or substances that are: * For Cohort 1: strong or moderate inducers of CYP3A4/5, CYP2C9, or UGT2B7 within 28 days or 5 half-lives plus 10 days prior to first dose of study intervention, and strong or moderate inhibitors of CYP3A4/5, CYP2C9, UGT1A9 or UGT2B7 within 5 half-lives or 10 days (whichever is longer) prior to first dose of study intervention. * For Cohort 2: strong or moderate inducers of UGT2B7 within 28 days or 5 half-lives plus 10 days prior to first dose of study intervention, and strong or moderate inhibitors of UGT2B7 within 5 half-lives or 10 days (whichever is longer) prior to first dose of study intervention. * Current use of concomitant medication(s) or unwillingness or inability to use a required concomitant medication(s). * Previous administration of an investigational product (drug or vaccine) within 30 days or 5 half lives preceding the first dose of study intervention used in this study (whichever is longer). * A positive urine drug test. A single repeat for positive drug screen may be allowed. * Use of tobacco or nicotine containing products within 3 months of screening or a positive urine cotinine test (ie, active smokers and those who currently use nicotine-containing products are excluded from participation in this study). * Screening supine BP ≥140 mm Hg (systolic) or ≥90 mm Hg (diastolic) for participants \<60 years; and ≥150/90 mm Hg for participants ≥60 years old, following at least 5 minutes of supine rest. If systolic BP is ≥ 140 or 150 mm Hg (based on age) or diastolic ≥90 mm Hg, the BP should be repeated 2 more times and the average of the 3 BP values should be used to determine the participant's eligibility. * An eGFR \< 60 (units of mL/min/1.73 m²) as determined by the CKD-EPI equation * Standard 12-lead ECG that demonstrates clinically relevant abnormalities that may affect participant safety or interpretation of study results * Participants with ANY of the following abnormalities in clinical laboratory tests at screening, as assessed by the study specific laboratory and confirmed by a single repeat test, if deemed necessary: ALT, AST, Bilirubin ≥1.5× ULN; participants with a history of Gilbert's syndrome may have direct bilirubin measured and would be eligible for this study provided the direct bilirubin level is ≤ ULN, Hemoglobin ≤ 11 g/dL ANC ≤ 1.5 × 109/L, Platelets ≤ 150,000/mm3/. \- History of alcohol abuse or repeated binge drinking and/or any other illicit drug use or dependence within 6 months of screening.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Pfizer Clinical Research Unit - New Haven
New Haven, Connecticut, 06511, United States
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