Ask to take part

Contact the study team using the details below to take part. If there are no contact details below please ask your doctor in the first instance.

Contact Information:

Trial questions or participation questions: 1-877-CTLILLY (1-877-285-4559) or 1-317-615-4559
LillyTrials@Lilly.com


Physicians interested in becoming principal investigators please contact clinical_inquiry_hub@lilly.com


Study Location:

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Be Part of Research - Trial Details - A Study of Retatrutide (LY3437943) in Participants With Obesity or Overweight

A Study of Retatrutide (LY3437943) in Participants With Obesity or Overweight

Medical Conditions

Obesity
Overweight


This information is provided directly by researchers, and we recognise that it isn't always easy to understand. We are working with researchers to improve the accessibility of this information. In some summaries, you may come across links to external websites. These websites will have more information to help you better understand the study.


The purpose of this study is to evaluate the efficacy and safety of retatrutide compared with placebo for body weight reduction.

Participation in the study will last about 65 weeks and may include about 18 visits.

Start dates may differ between countries and research sites. The research team are responsible for keeping the information up-to-date.  

The recruitment start and end dates are as follows:

Nov 2025 Jul 2027

INTERVENTIONAL

Intervention Type : DRUG
Intervention Description : Administered SC

Intervention Arm Group : Retatrutide Dose 1;Retatrutide Dose 2;

Intervention Type : DRUG
Intervention Description : Administered SC

Intervention Arm Group : Placebo;



You can take part if:



You may not be able to take part if:


This is in the inclusion criteria above


Below are the locations for where you can take part in the trial. Please note that not all sites may be open.

  • Albany House Medical Centre
    Wellingborough
    NN8 4RW
  • Layton Medical Centre
    Blackpool
    FY3 7EN
  • The Adam Practice
    Poole
    BH16 5PW
  • Cheadle Community Hospital
    Cheadle
    ST10 1NS
  • FutureMeds - Birmingham
    Birmingham
    B21 9RY
  • Woodstock Bower Surgery
    Rotherham
    S61 1AH
  • FutureMeds - Liverpool
    Bromborough
    CH62 6EE
  • Rame Group Practice
    Torpoint
    PL11 2TB
  • Bradford on Avon Health Centre
    Bradford-on-Avon
    BA15 1DQ
  • HMC Health Group - Meadows Centre for Health
    Hounslow
    TW4 7NR
  • St Bartholomew's Medical Centre
    Oxford
    OX4 1XB
  • Atlantic Medical
    Penzance
    TR18 3DX

Trial questions or participation questions: 1-877-CTLILLY (1-877-285-4559) or 1-317-615-4559
LillyTrials@Lilly.com


Physicians interested in becoming principal investigators please contact clinical_inquiry_hub@lilly.com



The study is sponsored by Eli Lilly and Company




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Read full details for Trial ID: NCT07232719
Last updated 19 March 2026

This page is to help you find out about a research study and if you may be able to take part

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