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PF-08653945

Phase 2

Overweight | Small molecule | Metabolic |Pfizer, Inc.|Last Updated: Aug 17, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials2
Total Enrollment929

FDA Designations

No designations recorded

Clinical trial landscape

PF-08653945 · 2 trials · 9 indications

Phase 2 1Phase 1 1
NCT07575932A Study of PF-08653945 and PF-08653944 in Adults With Overweight or Obesity (SOLIS-1)Overweight
RECRUITING872 Analytics
PHASE2RECRUITING
A Study of PF-08653945 and PF-08653944 in Adults With Overweight or Obesity (SOLIS-1)
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 A (Cohort 1)EXPERIMENTALParticipants will receive a single SC dose of PF 08653945 on Period 1 Day 1 administered to the abdomen.
Treatment B (Cohort 1)EXPERIMENTALParticipants will receive a single SC dose of PF 08653945 on Period 1 Day 1 administered to the thigh.
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 A (Optional Cohort 2)EXPERIMENTALJapanese participants 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 Sites65

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)

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
LOWJul 8, 2026NCT07575932lastUpdatePostDate: changed
LOWJul 8, 2026NCT07575932lastUpdatePostDate: changed
LOWJun 10, 2026NCT07575932Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 10, 2026NCT07575932Status: NOT_YET_RECRUITING → RECRUITING

Frequently asked questions about PF-08653945

What is PF-08653945 used for?

PF-08653945 is an investigational small molecule being developed for overweight and obesity. It is a Phase 2 metabolic therapy studied in adults with overweight or obesity, including conditions such as overnutrition and body weight disorders. The drug is not approved and remains in clinical development.

Who makes PF-08653945?

PF-08653945 is being developed by Pfizer, Inc. (NYSE: PFE). The company is conducting clinical trials of this investigational small molecule for the treatment of overweight and obesity in adults.

What phase is PF-08653945 in?

PF-08653945 is in Phase 2 clinical development. It is being studied in a Phase 2 trial (NCT07575932) for overweight and obesity, along with a Phase 1 pharmacokinetic study (NCT07725809). The drug is investigational and not yet approved.

What clinical trials is PF-08653945 in?

PF-08653945 is being evaluated in two trials. NCT07575932 is a Phase 2 study in adults with overweight or obesity, enrolling 872 participants in the United States and Canada. NCT07725809 is a Phase 1 study in Belgium examining how the drug is absorbed into the blood, enrolling 57 healthy adults.

Is PF-08653945 the same as PF-08653944?

PF-08653945 is distinct from PF-08653944, though both are being studied together in the Phase 2 SOLIS-1 trial (NCT07575932). The trial evaluates the combination of PF-08653945 and PF-08653944 in adults with overweight or obesity, but they are separate investigational compounds.