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PF-08653945

Phase 2

Overweight | Small molecule | Metabolic |Pfizer, Inc.|Trials Updated: Oct 13, 2026

PF-08653945 development status

Highest phase Phase 2
Registered trials 2 across 1 sponsor since May 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials2
Total Enrollment997

FDA Designations

No designations recorded

PF-08653945 clinical trials

PF-08653945 · 2 trials · 9 indications

Phase 2 1Phase 1 1
NCT07575932A Study of PF-08653945 and PF-08653944 in Adults With Overweight or ObesityOverweight
ACTIVE NOT_RECRUITING940 Analytics
PHASE2ACTIVE NOT_RECRUITING
A Study of PF-08653945 and PF-08653944 in Adults With Overweight or Obesity
OverweightUnlock trial analytics

Study Endpoints

Primary Endpoints

Percent change from baseline in body weight
Baseline (Week 0) to Week 48
Pharmacokinetics (PK): Area Under the Curve (AUC) of PF-08653945
Up to 57 days post-dose

AUC is a measure of the plasma concentration of the study drug over time. It is used to characterize absorption of the drug.

Pharmacokinetics (PK): Maximum Observed Concentration (Cmax) of PF-08653945
Up to 57 days post-dose

Cmax refers to the maximum observed serum concentration of the study drug.

Secondary Endpoints

Percent change from baseline in body weight
Baseline (Week 0) to Week 60
Change from baseline in body weight
Baseline (Week 0) to Week 48 and Week 60
Percentage of participants who achieve ≥5% of body weight reduction from baseline
Baseline (Week 0) to Week 48 and Week 60
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1EXPERIMENTALParticipants receive subcutaneous injections of PF-08653945 or placebo.
Cohort 2EXPERIMENTALParticipants receive subcutaneous injections of PF-08653945 + PF-08653944 or placebo.
Cohort 3EXPERIMENTALParticipants receive subcutaneous injections of PF-08653945 + PF-08653944 , PF-08653944 , or placebo.
Treatment C (Cohort 1)EXPERIMENTALParticipants will receive a single SC dose of PF 08653945 on Period 1 Day 1 administered to the upper arm.
Treatment B (Cohort 1)EXPERIMENTALParticipants will receive a single SC dose of PF 08653945 on Period 1 Day 1 administered to the thigh.
Treatment A (Optional Cohort 2)EXPERIMENTALJapanese participants will receive a single SC dose of PF 08653945 on Period 1 Day 1 administered to the abdomen.
Treatment A (Cohort 1)EXPERIMENTALParticipants will receive a single SC dose of PF 08653945 on Period 1 Day 1 administered to the abdomen.

Interventions

NameTypeDescription
PF-08653945DRUGSubcutaneous Injection
PF-08653944DRUGSubcutaneous Injection
PlaceboDRUGSubcutaneous Injection
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites63

Inclusion Criteria: Eligible participants for this study include: * adults aged 18 years or older with * obesity (BMI of 30.0 kg/m2 to 50.0 kg/m2) or with * overweight (BMI of 27.0 kg/m2 to \<30.0 kg/m2) who also have at least 1 prespecified weight-related comorbidity (hypertension, dyslipidemia, ...

Countries:United StatesCanadaBelgium
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Recent Changes (Last 90 Days)

LOWOct 13, 2026NCT07575932lastUpdatePostDate: changed
LOWOct 13, 2026NCT07575932lastUpdatePostDate: changed
MEDIUMSep 15, 2026NCT07575932Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMSep 15, 2026NCT07575932Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMSep 15, 2026NCT07575932Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWSep 9, 2026NCT07725809Status: NOT_YET_RECRUITING → RECRUITING
LOWSep 9, 2026NCT07725809Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 17, 2026NCT07575932lastUpdatePostDate: changed
LOWAug 17, 2026NCT07575932lastUpdatePostDate: changed
LOWJul 24, 2026NCT07725809NEW_TRIAL: changed
LOWJul 24, 2026NCT07725809NEW_TRIAL: changed
LOWJul 22, 2026NCT07575932lastUpdatePostDate: changed
LOWJul 22, 2026NCT07575932lastUpdatePostDate: changed

Frequently asked questions about PF-08653945

What is PF-08653945?

PF-08653945 is an investigational small molecule being developed by Pfizer, Inc. (NYSE: PFE) for the treatment of overweight and obesity. It is in Phase 2 clinical development and has not been approved by the FDA. Two clinical trials of PF-08653945 are ongoing, with a combined planned enrollment of 997 participants.

What is PF-08653945 used for?

PF-08653945 is being studied for use in adults with overweight or obesity. The Phase 2 trial NCT07575932 enrolls adults with overweight and/or obesity, while the Phase 1 trial NCT07725809 includes adults with overweight or obesity as well as healthy volunteers. It is investigational and not approved for any indication.

Who makes PF-08653945?

PF-08653945 is being developed by Pfizer, Inc., which trades on the New York Stock Exchange under the ticker PFE. Pfizer is the sponsor of both registered clinical trials of the compound, the Phase 1 study NCT07725809 and the Phase 2 study NCT07575932.

What phase is PF-08653945 in?

PF-08653945 is in Phase 2 clinical development. The Phase 2 trial NCT07575932 is active but no longer recruiting, and the Phase 1 trial NCT07725809 is currently recruiting. PF-08653945 is investigational and has not received FDA approval.

What clinical trials is PF-08653945 in?

PF-08653945 is being evaluated in two registered trials. NCT07575932 is a Phase 2 study of PF-08653945 and PF-08653944 in adults with overweight or obesity, enrolling 940 participants in the United States and Canada. NCT07725809 is a Phase 1 study in adults with overweight or obesity or healthy volunteers, enrolling 57 participants in Belgium.

Is PF-08653945 randomized and controlled?

Yes. The clinical program for PF-08653945 includes randomized, double-blind, controlled trial designs. The Phase 2 study NCT07575932 is a randomized, double-blind, controlled trial of PF-08653945 and PF-08653944 in adults with overweight or obesity, with 940 participants enrolled across sites in the United States and Canada.