NCT07845500RecruitingPhase 3
A Study to Learn About Switching to a Monthly Study Medicine Called Berobenatide (PF-08653944) to Help Keep Weight Off in People With Overweight or Obesity
A PHASE 3 STUDY TO EVALUATE THE SWITCH TO MONTHLY BEROBENATIDE FOR MAINTAINING WEIGHT IN ADULTS WHO ARE ON WEEKLY SEMAGLUTIDE OR TIRZEPATIDE (VESPER-SWITCH)
Source: ClinicalTrials.gov · Last updated 15 Oct 2026
Brief summary (registry, in English)
The purpose of this study is to learn about the safety and effectiveness of berobenatide in adults with overweight or obesity who have already lost weight while taking semaglutide or tirzepatide. The study does not include people with diabetes. Participants will be in the study for about 11 months.
- Status (registry)
- Recruiting
- Phase (registry)
- Phase 3
- Study type
- Interventional
- Enrollment
- 660 (estimated)
- First submitted
- 22 Sept 2026
- Start date
- 30 Sept 2026
- Primary completion date
- 16 Feb 2028
- Lead sponsor
- Pfizer
- Diseases
- Obesity
- NCT number
- NCT07845500
What you commit to
- Study type: Interventional · Phase 3
- Planned participants: 660
- From 30 Sept 2026 to the primary completion date, 16 Feb 2028
- 16 sites in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Other illness
- Diagnosis of any form of diabetes.
- History of acute or chronic pancreatitis.
- Personal or family history of medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia type 2 (MEN-2).
Who the study is looking for
- Aged ≥18 years.
- Currently taking semaglutide or tirzepatide for obesity management.
Age in the registry: 18 years to - · Sex: All · Does not accept healthy volunteers
Sites (16)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| University of Alabama at Birmingham Coordinator of this site? Confirm its status | Birmingham | United States | Recruiting |
| Mercury Street Medical Group, PLLC Coordinator of this site? Confirm its status | Butte | United States | Recruiting |
| Clinical Research Professionals Coordinator of this site? Confirm its status | Chesterfield | United States | Recruiting |
| Velocity Clinical Research, Mt. Auburn Coordinator of this site? Confirm its status | Cincinnati | United States | Recruiting |
| Aa Mrc Llc Coordinator of this site? Confirm its status | Flint | United States | Not yet recruiting |
| Tribe Clinical Research LLC Coordinator of this site? Confirm its status | Greenville | United States | Not yet recruiting |
| Jacksonville Center for Clinical Research Coordinator of this site? Confirm its status | Jacksonville | United States | Not yet recruiting |
| Velocity Clinical Research, Los Angeles Coordinator of this site? Confirm its status | Los Angeles | United States | Not yet recruiting |
| Monroe Biomedical Research Coordinator of this site? Confirm its status | Louisville | United States | Recruiting |
| Monroe Biomedical Research Coordinator of this site? Confirm its status | Monroe | United States | Not yet recruiting |
| Suncoast Clinical Research Coordinator of this site? Confirm its status | New Port Richey | United States | Not yet recruiting |
| Oviedo Medical Research Coordinator of this site? Confirm its status | Oviedo | United States | Not yet recruiting |
| SKY Integrative Medical Center/SKYCRNG Coordinator of this site? Confirm its status | Ridgeland | United States | Not yet recruiting |
| Southern California Clinical Research Coordinator of this site? Confirm its status | Santa Ana | United States | Not yet recruiting |
| Diablo Clinical Research, LLC dba Flourish Research Coordinator of this site? Confirm its status | Walnut Creek | United States | Not yet recruiting |
| Accellacare - Wilmington Coordinator of this site? Confirm its status | Wilmington | United States | Not yet recruiting |
This page is information, not medical advice. Discuss any trial with your doctor.