A Study to Learn How Different Amounts of the Study Medicine Called PF-08642534 Are Tolerated and Act in the Body of People Who Have Obesity

July 24, 2026 updated by: Pfizer

A PHASE 1, RANDOMIZED, DOUBLE-BLIND, SPONSOR-OPEN, PLACEBO-CONTROLLED STUDY TO INVESTIGATE SAFETY, TOLERABILITY AND PHARMACOKINETICS OF MULTIPLE ASCENDING ORAL DOSES OF PF-08642534 IN ADULTS WITH OBESITY

This study will look at a study drug called PF-08642534 in people with obesity (have too much body weight) to see: if participants can take different amounts (doses) of the study drug in a safe way and how adults with obesity tolerate it, and how the body handles the study drug (for example, how the study drug is absorbed and removed from the body).

People who want to join the study will first go through a screening period of up to 4 weeks. Doctors will check if each person meets the study conditions, including age, body weight, and general health. People with certain medical conditions will not be able to take part in the study.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

120

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • California
      • Lake Forest, California, United States, 92630
        • Orange County Research Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion:

  • Body mass index (BMI) ≥30.0 and ≤40.0 kg/m², and with stable body weight prior to screening.
  • Participants are generally otherwise healthy but may have mild chronic conditions (eg, dyslipidemia or hypertension)

Exclusion:

- Individuals with diabetes, significant cardiovascular, hepatic, renal, gastrointestinal, or psychiatric disorders, or conditions that may affect drug absorption or metabolism, are not eligible to participate.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Randomized
  • Interventional Model: Sequential Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Placebo
Participants will receive matching placebo QD
Drug: Placebo
Participants will receive matching placebo QD (once a day)
Experimental: PF-08642534
Participants will receive PF-08642534 QD
Drug: PF-08642534
Participants will receive PF-08642534 QD (once a day)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Incidence of treatment emergent adverse events (TEAE)
Time Frame: Baseline up to 8 weeks after last dose
Baseline up to 8 weeks after last dose

Secondary Outcome Measures

Outcome Measure
Time Frame
Area Under the Curve From Time Zero to End of Dosing Interval (AUCtau) of PF-08642534
Time Frame: 0 (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24 hours post-dose
0 (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24 hours post-dose
Maximum Observed Plasma Concentration (Cmax) of PF-08642534
Time Frame: 0 (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24 hours post-dose
0 (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24 hours post-dose

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Pfizer

Investigators

  • Study Director: Pfizer CT.gov Call Center, Pfizer

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

July 28, 2026

Primary Completion (Estimated)

April 21, 2027

Study Completion (Estimated)

April 21, 2027

Study Registration Dates

First Submitted

July 24, 2026

First Submitted That Met QC Criteria

July 24, 2026

First Posted (Actual)

July 28, 2026

Study Record Updates

Last Update Posted (Actual)

July 28, 2026

Last Update Submitted That Met QC Criteria

July 24, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • C6601003

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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