A Study of Tirzepatide (LY3298176) in Participants With Obesity or Overweight With Weight Related Comorbidities (SURMOUNT-5)

November 14, 2025 updated by: Eli Lilly and Company

A Phase 3b, Randomized Controlled Study to Evaluate the Efficacy and Safety of Tirzepatide Compared to Semaglutide in Adults Who Have Obesity or Overweight With Weight Related Comorbidities

The main purpose of this phase 3b study is to evaluate the efficacy and safety of tirzepatide compared with semaglutide in adult participants who have obesity or overweight with weight related comorbidities without Type 2 Diabetes. The study will last around 74 weeks.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
751

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.
  • Name: There may be multiple sites in this clinical trial. 1-877-CTLILLY (1-877-285-4559) or
  • Phone Number: 1-317-615-4559
  • Email: ClinicalTrials.gov@lilly.com

Study Locations

  • Puerto Rico
      • Ponce, Puerto Rico, 00717
        • Puerto Rico Medical Research
      • Vega Baja, Puerto Rico, 00694
        • Wellness Clinical Research Vega Baja
  • United States
    • Alabama
      • Birmingham, Alabama, United States, 35242
        • Cahaba Research
      • Pelham, Alabama, United States, 35124
        • Cahaba Research - Pelham
    • California
      • Santa Ana, California, United States, 92701
        • Southern California Dermatology, Inc.
      • Spring Valley, California, United States, 91978
        • Encompass Clinical Research
      • Tustin, California, United States, 92780
        • University Clinical Investigators, Inc.
    • Florida
      • Hallandale, Florida, United States, 33009
        • Velocity Clinical Research, Hallandale Beach
      • Miami, Florida, United States, 33165
        • New Horizon Research Center
      • Tampa, Florida, United States, 33613-1244
        • ForCare Clinical Research
    • Georgia
      • Union City, Georgia, United States, 30291
        • Rophe Adult and Pediatric Medicine/SKYCRNG
    • Idaho
      • Idaho Falls, Idaho, United States, 83404
        • Rocky Mountain Clinical Research
    • Iowa
      • West Des Moines, Iowa, United States, 50265
        • Iowa Diabetes and Endocrinology Research Center
    • Kentucky
      • Louisville, Kentucky, United States, 40213
        • L-MARC Research Center
    • Michigan
      • Troy, Michigan, United States, 48098
        • Arcturus Healthcare , PLC, Troy Internal Medicine Research Division
    • Mississippi
      • Fayette, Mississippi, United States, 39069
        • Prime Health and Wellness/SKYCRNG
    • Missouri
      • City of Saint Peters, Missouri, United States, 63303
        • StudyMetrix Research
    • Nevada
      • Las Vegas, Nevada, United States, 89148
        • Palm Research Center Sunset
      • Las Vegas, Nevada, United States, 89128
        • Palm Research Center Tenaya
    • New York
      • New York, New York, United States, 10021
        • Weill Cornell Medical College
    • North Carolina
      • Greensboro, North Carolina, United States, 27408
        • PharmQuest
    • North Dakota
      • Fargo, North Dakota, United States, 58104
        • Lillestol Research
    • Oklahoma
      • Norman, Oklahoma, United States, 73069
        • Alliance for Multispecialty Research, LLC
    • South Carolina
      • Greenville, South Carolina, United States, 29607
        • Tribe Clinical Research, LLC
    • Tennessee
      • Chattanooga, Tennessee, United States, 37421
        • WR-ClinSearch, LLC
    • Texas
      • Bellaire, Texas, United States, 77401
        • The University of Texas Health Science Center at Houston
      • Dallas, Texas, United States, 75230
        • Dallas Diabetes Research Center
      • Dallas, Texas, United States, 75231
        • North Texas Endocrine Center
      • Houston, Texas, United States, 77043
        • Biopharma Informatic, LLC
      • Houston, Texas, United States, 77079
        • PlanIt Research, PLLC
      • Mesquite, Texas, United States, 75149
        • Southern Endocrinology Associates
      • San Antonio, Texas, United States, 78229
        • Pinnacle Clinical Research

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Have a body mass index (BMI) of ≥30 kilogram per square meter (kg/m²) or ≥27 kg/m² and previously diagnosed with at least one of the following weight related comorbidities: hypertension, dyslipidemia, obstructive sleep apnea, cardiovascular disease
  • Have a history of at least 1 unsuccessful dietary effort to lose body weight

Exclusion Criteria:

  • Diabetes mellitus
  • Change in body weight greater than 5 kg within 3 months prior to starting study
  • Obesity induced by other endocrinologic disorders or monogenetic or syndromic forms of obesity
  • History of pancreatitis
  • Family or personal history of medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia syndrome type 2 (MEN-2)
  • History of significant active or unstable major depressive disorder (MDD) or other severe psychiatric disorder within the last 2 years

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: 15 mg or MTD - Tirzepatide
Participants received a starting dose of 2.5 milligrams (mg) tirzepatide administered subcutaneously (SC) once weekly (QW) for 4 weeks, then the dose was increased by 2.5 mg every 4 weeks (2.5 to 5 to 7.5 to 10 to 12.5 to 15 mg) up to 15 mg QW or maximum tolerated dose [MTD (10 mg or 15 mg)] until Week 72.
Drug: Tirzepatide
Administered SC
Other Names:
  • LY3298176
Active Comparator: 2.4 mg or MTD - Semaglutide
Participants received a starting dose of 0.25 mg semaglutide administered SC QW for 4 weeks, then the dose was increased every 4 weeks (0.25 to 0.5 to 1.0 to 1.7 to 2.4 mg) up to 2.4 mg QW or MTD (1.7 mg or 2.4 mg) until Week 72.
Drug: Semaglutide
Administered SC

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Percent Change From Baseline in Body Weight
Time Frame: Baseline, Week 72
Percent change from baseline in body weight was reported. Least Squares (LS) mean was determined using ANCOVA model with Baseline + Baseline BMI Group 1 + Sex + Pre diabetes status at randomization + Treatment (Type III sum of squares) as variables.
Baseline, Week 72

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Percentage of Participants Who Achieve ≥10% Body Weight Reduction
Time Frame: Week 72
Percentage of participants who achieved ≥10% body weight reduction (observed values) was reported.
Week 72
Percentage of Participants Who Achieve ≥15% Body Weight Reduction
Time Frame: Week 72
Percentage of participants who achieved ≥15% body weight reduction (observed values) was reported.
Week 72
Percentage of Participants Who Achieve ≥20% Body Weight Reduction
Time Frame: Week 72
Percentage of participants who achieved ≥20% body weight reduction (observed values) was reported.
Week 72
Percentage of Participants Who Achieve ≥25% Body Weight Reduction
Time Frame: Week 72
Percentage of participants who achieved ≥25% body weight reduction (observed values) was reported.
Week 72
Change From Baseline in Waist Circumference in Centimeter
Time Frame: Baseline, Week 72
Change from baseline in waist circumference in centimeter was reported. LS mean was determined using ANCOVA model with Baseline + Baseline BMI Group 1 + Sex + Pre diabetes status at randomization + Treatment (Type III sum of squares) as variables.
Baseline, Week 72
Percentage of Participants Who Achieve ≥30% Body Weight Reduction
Time Frame: Week 72
Percentage of participants who achieved ≥30% body weight reduction (observed values) was reported.
Week 72
Change From Baseline in Body Mass Index (BMI)
Time Frame: Baseline, Week 72
Change from baseline in BMI was reported. LS mean was determined using Mixed Model Repeated Measures (MMRM) model using Baseline + Sex + Pre diabetes status at randomization + Treatment + Time + Treatment*Time(Type III sum of squares) as variables.
Baseline, Week 72
Percent Change From Baseline in Body Weight Comparing 15 mg Tirzepatide and 2.4 mg Semaglutide
Time Frame: Baseline, Week 72
Percent change from baseline in body weight comparing 15mg of Tirzepatide and 2.4 mg Semaglutide was reported. The treatment effect for tirzepatide versus semaglutide for percent change in body weight was also evaluated assuming that participants had stayed on treatment and reached the highest dose of treatment. LS mean was determined by MMRM model using Baseline + Sex + Pre diabetes status at randomization + Baseline BMI Group 1 + Treatment + Time + Treatment*Time (Type III sum of squares) as variables.
Baseline, Week 72

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Eli Lilly and Company

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Call 1-877-CTLILLY (1-877-285-4559) or 1-317-615-4559 Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST), Eli Lilly and Company

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 21, 2023

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 13, 2024

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
November 13, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 16, 2022

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 10, 2023

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 21, 2023

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 26, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 14, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 17203
  • I8F-MC-GPHJ (Other Identifier: Eli Lilly and Company)
  • U1111-1283-5404 (Other Identifier: UTN Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Anonymized individual patient level data will be provided in a secure access environment upon approval of a research proposal and a signed data sharing agreement

IPD Sharing Time Frame

Data are available 6 months after the primary publication and approval of the indication studied in the US and European Union (EU), whichever is later. Data will be indefinitely available for requesting.

IPD Sharing Access Criteria

A research proposal must be approved by an independent review panel and researchers must sign a data sharing agreement.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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