Pfizer tests drug interactions in healthy volunteers
NCT ID NCT06837259
First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This completed Phase 1 study looked at how two common drugs—cyclosporine and clarithromycin—affect the levels of a new experimental medicine called PF-07328948 in the body. Twenty-six healthy adults received PF-07328948 alone and then with cyclosporine or clarithromycin. The goal was to understand drug interactions and safety, not to treat any disease.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- PF-07328948
- What this could lead to
- If successful, this study could help determine safe and effective dosing of PF-07328948 when taken with other drugs.
- What could go wrong
- This is a very early, small study in healthy volunteers, not patients. Results may not predict real-world effects or safety.
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
-
26 people
The number who actually took part.
- Started
-
Mar 2025
- Finished
-
Jun 2025
- Lead sponsor
-
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 years and older
- Sex
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Anyone
- Healthy volunteers
-
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: * Males and females (of non-childbearing potential) who are overtly healthy. * Body mass index of 18.5-35 kg/m2; and a total body weight \>50 kg (110 lb). Exclusion: * Evidence or history of clinically significant 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 medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality or other conditions that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study. * Screening supine blood pressure (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. * Evidence of a prothrombotic state (history of deep vein thrombosis, pulmonary embolism, or arterial thrombosis or a known genetic predisposition \[Factor V Leiden, prothrombin G20210A, Protein C/S deficiency, antithrombin deficiency\]) * An eGFR \<60 units mL/min/1.73m², as determined by the CKD-EPI equation using serum creatinine * Standard 12 lead ECG that demonstrates clinically relevant abnormalities that may affect participant safety or interpretation of study results (eg, QTcF \>450 ms, complete left bundle branch block (LBBB), signs of an acute or indeterminate age myocardial infarction, ST segment and/or T wave changes suggestive of myocardial ischemia, second or third degree AV block, or serious bradyarrhythmias or tachyarrhythmias). * 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 x ULN.
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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
-
Pfizer Clinical Research Unit - Brussels
Brussels, Bruxelles-capitale, Région de, B-1070, Belgium
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