NCT07575932 · Pfizer
A Study of PF-08653945 and PF-08653944 in Adults With Overweight or Obesity (SOLIS-1)
(SOLIS-1)
What this study is about
This study is being done to learn about the safety and effects of the study drugs, PF-08653945 and PF-08653944, when given alone or together for weight loss, compared to a placebo (a dummy drug that has no active ingredient in it).
View original scientific description
This study is being done to learn about the safety and effects of the study drugs, PF-08653945 and PF-08653944, when given alone or together for weight loss, compared to a placebo (a dummy drug that has no active ingredient in it).
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
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, cardiovascular disease, or obstructive sleep apnea), at the screening visit.
Exclusion criteria
- Participants who are not eligible include those with diabetes mellitus, a body weight change of \>5% or use of weight loss medications in the 12 weeks prior to screening, a history of or plan for surgical treatment for obesity, and those who are unable or unwilling to comply with contraceptive requirements or are pregnant or lactating.
Where
- Chandler, Arizona
- Sun City West, Arizona
- Tucson, Arizona
- Canoga Park, California
- Fountain Valley, California
- Garden Grove, California
- Lomita, California
- Long Beach, California
- Los Alamitos, California
- Modesto, California
- San Diego, California
- Tustin, California
And 38 more locations — see the full list below.
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jul 8, 2026 · Source of record for eligibility and locations