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)
1 other identifier
interventional
660
1 country
8
Brief Summary
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.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P75+ for phase_3 obesity
Started Oct 2026
Shorter than P25 for phase_3 obesity
8 active sites
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
Click on a node to explore related trials.
Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
September 22, 2026
CompletedFirst Posted
Study publicly available on registry
September 29, 2026
CompletedStudy Start
First participant enrolled
October 1, 2026
CompletedPrimary Completion
Last participant's last visit for primary outcome
February 16, 2028
ExpectedStudy Completion
Last participant's last visit for all outcomes
February 16, 2028
September 29, 2026
September 1, 2026
1.4 years
September 22, 2026
September 22, 2026
Conditions
Keywords
Outcome Measures
Primary Outcomes (1)
Percent change from baseline in body weight
Baseline, Week 32
Secondary Outcomes (6)
Change from baseline in body weight
Baseline, Week 32
Number of Participants With Treatment Emergent Adverse Events (TEAEs)
Baseline, Week 32
Number of Participants with Serious adverse events (SAEs)
Baseline, Week 32
Number of Participants with adverse events leading to discontinuation
Baseline, Week 32
Number of Participants with Adverse Events of Special Interest (AESIs)
Baseline, Week 32
- +1 more secondary outcomes
Study Arms (2)
Active Comparator
ACTIVE COMPARATORParticipants will receive Semaglutide or Tirzepatide by Subcutaneous Injection.
Experimental
EXPERIMENTALParticipants will receive Berobenatide by Subcutaneous Injection.
Interventions
Participants will receive berobenatide solution for injection as subcutaneous injection.
Eligibility Criteria
You may qualify if:
- Aged ≥18 years.
- Currently taking semaglutide or tirzepatide for obesity management.
You may not qualify if:
- 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).
Contact the study team to confirm eligibility.
Sponsors & Collaborators
- Pfizerlead
Study Sites (8)
University of Alabama at Birmingham
Birmingham, Alabama, 35294, United States
Suncoast Clinical Research
New Port Richey, Florida, 34652, United States
Monroe Biomedical Research
Louisville, Kentucky, 40213, United States
Aa Mrc Llc
Flint, Michigan, 48504, United States
Clinical Research Professionals
Chesterfield, Missouri, 63005, United States
Mercury Street Medical Group, PLLC
Butte, Montana, 59701, United States
Accellacare - Wilmington
Wilmington, North Carolina, 28401, United States
Velocity Clinical Research, Mt. Auburn
Cincinnati, Ohio, 45219, United States
Related Links
MeSH Terms
Conditions
Interventions
Condition Hierarchy (Ancestors)
Intervention Hierarchy (Ancestors)
Study Officials
- STUDY DIRECTOR
Pfizer CT.gov Call Center
Pfizer
Central Study Contacts
Study Design
- Study Type
- interventional
- Phase
- phase 3
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- TREATMENT
- Intervention Model
- PARALLEL
- Sponsor Type
- INDUSTRY
- Responsible Party
- SPONSOR
Study Record Dates
First Submitted
September 22, 2026
First Posted
September 29, 2026
Study Start
October 1, 2026
Primary Completion (Estimated)
February 16, 2028
Study Completion (Estimated)
February 16, 2028
Last Updated
September 29, 2026
Record last verified: 2026-09
Data Sharing
- IPD Sharing
- Will share
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.