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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

Full criteria on ClinicalTrials.gov

Sites (16)

Sites in registry order. Pick your city on the disease page to sort them by distance.

SiteCityCountrySite status
University of Alabama at Birmingham
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BirminghamUnited StatesRecruiting
Mercury Street Medical Group, PLLC
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ButteUnited StatesRecruiting
Clinical Research Professionals
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ChesterfieldUnited StatesRecruiting
Velocity Clinical Research, Mt. Auburn
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CincinnatiUnited StatesRecruiting
Aa Mrc Llc
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FlintUnited StatesNot yet recruiting
Tribe Clinical Research LLC
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GreenvilleUnited StatesNot yet recruiting
Jacksonville Center for Clinical Research
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JacksonvilleUnited StatesNot yet recruiting
Velocity Clinical Research, Los Angeles
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Los AngelesUnited StatesNot yet recruiting
Monroe Biomedical Research
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LouisvilleUnited StatesRecruiting
Monroe Biomedical Research
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MonroeUnited StatesNot yet recruiting
Suncoast Clinical Research
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New Port RicheyUnited StatesNot yet recruiting
Oviedo Medical Research
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OviedoUnited StatesNot yet recruiting
SKY Integrative Medical Center/SKYCRNG
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RidgelandUnited StatesNot yet recruiting
Southern California Clinical Research
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Santa AnaUnited StatesNot yet recruiting
Diablo Clinical Research, LLC dba Flourish Research
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Walnut CreekUnited StatesNot yet recruiting
Accellacare - Wilmington
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WilmingtonUnited StatesNot yet recruiting

This page is information, not medical advice. Discuss any trial with your doctor.