A Study of Orforglipron (LY3502970) in Adult Participants With Obesity or Overweight With Weight-Related Comorbidities (ATTAIN-1)

November 3, 2025 updated by: Eli Lilly and Company

A Phase 3, Randomized, Double-Blind Study to Investigate the Efficacy and Safety of Once-Daily Oral Orforglipron Compared With Placebo in Adult Participants With Obesity or Overweight With Weight-Related Comorbidities (ATTAIN-1)

This study will investigate the efficacy and safety of once daily oral orforglipron in adult participants with obesity or overweight with weight-related comorbidities. The study has two phases: a main phase and an extension phase. The main phase of the study lasted 72 weeks. Participants with prediabetes will continue in the extension for another 2 years.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

3127

Phase

  • 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 Locations

  • Brazil
      • Rio de Janeiro, Brazil, 22061-080
        • Hospital São Lucas de Copacabana
      • São Paulo, Brazil, 01228-000
        • CPQuali Pesquisa Clínica
      • São Paulo, Brazil, 04266-010
        • CEPIC - Centro Paulista de Investigacao Clinica
      • São Paulo, Brazil, 05403-000
        • Hospital das Clinicas FMUSP
    • Ceará
      • Fortaleza, Ceará, Brazil, 60430-350
        • Centro de Pesquisas em Diabetes e Doenças Endócrino-metabólicas
    • Espírito Santo
      • Vitória, Espírito Santo, Brazil, 29055450
        • CEDOES
    • Maranhão
      • Bequimão, Maranhão, Brazil, 65060-645
        • Hospital Sao Domingos
    • Paraná
      • Curitiba, Paraná, Brazil, 80030-480
        • Cline Research Center
      • Curitiba, Paraná, Brazil, 80045170
        • Quanta Diagnóstico e Terapia
    • Rio Grande do Sul
      • Porto Alegre, Rio Grande do Sul, Brazil, 90430-001
        • Nucleo de Pesquisa Clinica do Rio Grande do Sul
    • São Paulo
      • Campinas, São Paulo, Brazil, 13060-803
        • Centro de Pesquisa São Lucas
      • Jaú, São Paulo, Brazil, 17201130
        • CECIP - Centro de Estudos do Interior Paulista
      • São Bernardo do Campo, São Paulo, Brazil, 09715-090
        • Centro Multidisciplinar de Estudos Clinicos
      • Votuporanga, São Paulo, Brazil, 15501-405
        • INTEGRAL Pesquisa e Ensino
  • China
    • Anhui
      • Hefei, Anhui, China, 230011
        • The Second People's Hospital of Hefei
    • Beijing Municipality
      • Beijing, Beijing Municipality, China, 100853
        • Chinese PLA General Hospital
    • Chongqing Municipality
      • Chongqing, Chongqing Municipality, China, 404117
        • Chongqing General Hospital
    • Guangdong
      • Shenzhen, Guangdong, China, 518020
        • Shenzhen People's Hospital
    • Hainan
      • Haikou, Hainan, China, 570311
        • Hainan General Hospital
    • Heilongjiang
      • Harbin, Heilongjiang, China, 150001
        • The Fourth Affiliated Hospital of Harbin Medical University
    • Henan
      • Luoyang Shi, Henan, China, 471003
        • The First Affiliated Hospital of Henan University of Science &Technology
      • Zhengzhou, Henan, China, 450014
        • The Second Affiliated Hospital of Zhengzhou University
    • Jiangsu
      • Nanjing, Jiangsu, China, 210006
        • Nanjing First Hospital
      • Nanjing, Jiangsu, China, 210011
        • The Second Affiliated Hospital of Nanjing Medical University
      • Suzhou, Jiangsu, China, 215006
        • the First Affiliated Hospital of Soochow University
      • Zhenjiang, Jiangsu, China, 212000
        • Affiliated Hospital of Jiangsu University
    • Jiangxi
      • Nanchang, Jiangxi, China, 330006
        • Jiangxi Provincial People's Hospital
    • Shandong
      • Jinan, Shandong, China, 250013
        • Jinan Central Hospital
    • Shanghai Municipality
      • Shanghai, Shanghai Municipality, China, 201800
        • Jiading District Central Hospital
    • Tianjin Municipality
      • Tianjin, Tianjin Municipality, China, 300052
        • Tianjin Medical University General Hospital
      • Tianjin, Tianjin Municipality, China, 300134
        • Tianjin Medical University Zhu Xianyi Memorial Hospital
    • Yunnan
      • Kunming, Yunnan, China, 650034
        • The First People's Hospital of Yunnan Province
    • Zhejiang
      • Hangzhou, Zhejiang, China, 310013
        • Zhejiang Hospital
      • Ningbo, Zhejiang, China, 315010
        • Ningbo First Hospital
  • India
    • Andhra Pradesh
      • Guntur, Andhra Pradesh, India, 522001
        • Endolife Speciality Hospitals
    • Karnataka
      • Bangalore, Karnataka, India, 560002
        • Victoria Hospital, Bangalore Medical College And Research Institute
      • Mysore, Karnataka, India, 570001
        • Mysore Medical College
    • Maharashtra
      • Nagpur, Maharashtra, India, 441108
        • All India Institute of Medical Sciences (AIIMS) - Nagpur
      • Nagpur, Maharashtra, India, 440015
        • Central India Cardiology and Research Institute
      • Pune, Maharashtra, India, 411004
        • Deenanath Mangeshkar Hospital & Research Centre
      • Pune, Maharashtra, India, 411004
        • Sahyadri Super Speciality Hospital
      • Pune, Maharashtra, India, 411057
        • Lifepoint Multispeciality Hospital
  • Japan
      • Fukuoka, Japan, 812-0025
        • Boocs Clinic Fukuoka
      • Osaka, Japan, 530-0001
        • Osaka Nishiumeda Clinic
    • Fukuoka
      • Wakasugi, Fukuoka, Japan, 811-2310
        • Oishi Clinic
    • Hiroshima
      • Aki-gun, Hiroshima, Japan, 735-0017
        • Mazda Hospital
    • Ibaraki
      • Tsuchiura, Ibaraki, Japan, 300-0012
        • Tsuchiura Medical & Health Care Center
    • Kagawa-ken
      • Takamatsu, Kagawa-ken, Japan, 760-0076
        • NTT Nishinihon Takamatsu Clinic
      • Zentsujichó, Kagawa-ken, Japan, 765-0071
        • Iwamoto Internal Medicine Clinic
    • Kanagawa
      • Yokohama, Kanagawa, Japan, 232-0064
        • Yokohama Minoru Clinic
    • Osaka
      • Suita-shi, Osaka, Japan, 565-0853
        • Medical Corporation Heishinkai OCROM Clinic
    • Saitama
      • Sōka, Saitama, Japan, 340-0015
        • Sugiura Internal Medicine Clinic
    • Tokyo
      • Adachi-ku, Tokyo, Japan, 120-0022
        • Adachi Kyosai Hospital
      • Chuo-ku, Tokyo, Japan, 103-0027
        • Tokyo-Eki Center-building Clinic
      • Chuo-ku, Tokyo, Japan, 104-0031
        • Fukuwa Clinic
      • Chuo-ku, Tokyo, Japan, 103-0027
        • Medical Corporation Chiseikai Tokyo Center Clinic
      • Meguro-ku, Tokyo, Japan, 153-0053
        • Yutenji Medical Clinic
      • Mitaka, Tokyo, Japan, 181-0013
        • Kanno Naika
      • Setagaya-ku, Tokyo, Japan, 155-0031
        • Shimokitazawa Tomo Clinic
      • Shinjuku-ku, Tokyo, Japan, 160-0008
        • Heishinkai Medical Group ToCROM Clinic
  • Puerto Rico
      • Dorado, Puerto Rico, 00646
        • Dorado Medical Complex
    • PR
      • San Juan, PR, Puerto Rico, 00917
        • GCM Medical Group, PSC - Hato Rey Site
  • Slovakia
      • Bratislava, Slovakia, 831 03
        • MediTask
    • Banská Bystrica Region
      • Lučenec, Banská Bystrica Region, Slovakia, 984 01
        • Nemocnica s poliklinikou Lucenec
    • Bratislava Region
      • Bratislava, Bratislava Region, Slovakia, 811 08
        • Metabol KLINIK
    • Košice Region
      • Košice, Košice Region, Slovakia, 04001
        • Human Care s.r.o.
      • Trebišov, Košice Region, Slovakia, 075 01
        • ARETEUS s.r.o.
    • Košický Kr
      • Rožňava, Košický Kr, Slovakia, 048 01
        • DIAB sro
    • Presov
      • Sabinov, Presov, Slovakia, 083 01
        • MEDI-DIA s.r.o.
    • Trenčín Region
      • Púchov, Trenčín Region, Slovakia, 020 01
        • DIA-MED CENTRUM s.r.o.
  • South Korea
    • Incheon-gw
      • Namdong-gu, Incheon-gw, South Korea, 21565
        • Gachon University Gil Medical Center
    • Kyǒnggi-do
      • Ansan-si, Kyǒnggi-do, South Korea, 15355
        • Korea University Ansan Hospital
      • Anyang-si, Kyǒnggi-do, South Korea, 14068
        • Hallym University Sacred Heart Hospital
      • Suwon, Kyǒnggi-do, South Korea, 16499
        • Ajou University Hospital
    • Kyǒngsangnam-do
      • Busan, Kyǒngsangnam-do, South Korea, 50612
        • Pusan National University Yangsan Hospital
    • Seoul-teukbyeolsi [Seoul]
      • Seoul, Seoul-teukbyeolsi [Seoul], South Korea, 03080
        • Seoul National University Hospital
    • Taejǒn-Kwangyǒkshi
      • Seogu, Taejǒn-Kwangyǒkshi, South Korea, 35365
        • Konyang University Hospital
  • Spain
      • Valencia, Spain, 46026
        • Hospital Universitari i Politecnic La Fe
    • A Coruña [La Coruña]
      • A Coruña, A Coruña [La Coruña], Spain, 15006
        • CHUAC-Complejo Hospitalario Universitario A Coruña
      • Ferrol, A Coruña [La Coruña], Spain, 15405
        • Complejo Hospitalario Universitario de Ferrol (CHUF)- Hospital Naval
    • Almería
      • Almería, Almería, Spain, 04009
        • Centro Periferico De Especialidades Bola Azul
    • Andalusia
      • Málaga, Andalusia, Spain, 29010
        • Hospital Universitario Virgen de la Victoria
      • Seville, Andalusia, Spain, 41010
        • Hospital Quiron Infanta Luisa
    • Barcelona [Barcelona]
      • Badalona, Barcelona [Barcelona], Spain, 08916
        • Hospital Germans Trias i Pujol
      • Barcelona, Barcelona [Barcelona], Spain, 08035
        • Hospital Universitari Vall d'Hebron
      • Barcelona, Barcelona [Barcelona], Spain, 08022
        • Centro Médico Teknon
    • Castille and León
      • Valladolid, Castille and León, Spain, 47010
        • Hospital Clinico Universitario de Valladolid
    • Cádiz
      • Sanlúcar de Barrameda, Cádiz, Spain, 11540
        • Hospital Virgen del Camino
      • Villamartín, Cádiz, Spain, 11650
        • Hospital Virgen de las Montañas
    • Valenciana, Comunitat
      • Valencia, Valenciana, Comunitat, Spain, 46014
        • Hospital General Universitario de Valencia
  • Taiwan
      • Changhua, Taiwan, 50006
        • Changhua Christian Hospital
      • Kaohsiung City, Taiwan, 807
        • Kaohsiung Medical University Chung-Ho Memorial Hospital
      • Tainan City, Taiwan, 704
        • National Cheng Kung University Hospital
    • Chiayi
      • Chiayi City, Chiayi, Taiwan, 600
        • Chiayi Christian Hospital
    • Kaohsiung
      • Kaohsiung Niao Sung Dist, Kaohsiung, Taiwan, 83301
        • Chang Gung Memorial Hospital at Kaohsiung
  • United States
    • Arizona
      • Chandler, Arizona, United States, 85225
        • The Institute for Liver Health II dba Arizona Clinical Trials - Mesa
      • Sun City West, Arizona, United States, 85375
        • Clinical Research Institute of Arizona (CRI) - Sun City West
    • California
      • Concord, California, United States, 94520
        • John Muir Physician Network Research Center
      • Escondido, California, United States, 92025
        • AMCR Institute
      • Greenbrae, California, United States, 94904
        • NorCal Medical Research, Inc
      • Huntington Park, California, United States, 90255
        • Velocity Clinical Research, Huntington Park
      • Los Angeles, California, United States, 90057
        • Velocity Clinical Research, Westlake
      • Montclair, California, United States, 91763
        • Catalina Research Institute, LLC
      • San Ramon, California, United States, 94583
        • Norcal Endocrinology & Internal Medicine
      • Tustin, California, United States, 92780
        • University Clinical Investigators, Inc.
    • Colorado
      • Aurora, Colorado, United States, 80045
        • University of Colorado Anschutz Medical Campus
    • Florida
      • Miami, Florida, United States, 33186
        • New Age Medical Research Corporation
      • Miramar, Florida, United States, 33027
        • South Broward Research
      • Ocala, Florida, United States, 34470
        • Renstar Medical Research
      • Tampa, Florida, United States, 33619
        • Jedidiah Clinical Research - Tampa - Bay Plaza
      • Winter Park, Florida, United States, 32789
        • Clinical Site Partners, LLC dba Flourish Research
    • Georgia
      • Lawrenceville, Georgia, United States, 30046
        • Physicians Research Associates
      • Macon, Georgia, United States, 31210
        • East Coast Institute For Research, LLC
      • Union City, Georgia, United States, 30291
        • Rophe Adult and Pediatric Medicine/SKYCRNG
    • Hawaii
      • Honolulu, Hawaii, United States, 96814
        • East-West Medical Research Institute
    • Idaho
      • Blackfoot, Idaho, United States, 83221
        • Elite Clinical Trials
    • Kansas
      • Topeka, Kansas, United States, 66606
        • Cotton O'Neil Clinical Research Center
      • Topeka, Kansas, United States, 66606
        • Cotton O'Neil Diabetes & Endocrinology
    • Louisiana
      • Baton Rouge, Louisiana, United States, 70808
        • Pennington Biomedical Research Center
      • Lake Charles, Louisiana, United States, 70601
        • Care Access - Lake Charles
    • Maryland
      • Hyattsville, Maryland, United States, 20782
        • MedStar Health Research Institute (MedStar Physician Based Research Network)
      • Rockville, Maryland, United States, 20852
        • Endocrine and Metabolic Consultants
    • Michigan
      • Troy, Michigan, United States, 48098
        • Arcturus Healthcare , PLC, Troy Internal Medicine Research Division
    • Mississippi
      • Ridgeland, Mississippi, United States, 39157
        • SKY Integrative Medical Center/SKYCRNG
    • Nevada
      • Las Vegas, Nevada, United States, 89128
        • Las Vegas Medical Research
    • New York
      • Lake Success, New York, United States, 11042
        • Long Island Cardiovascular Consultants
      • New York, New York, United States, 10021
        • Weill Cornell Medical College
    • Oklahoma
      • Norman, Oklahoma, United States, 73069
        • Alliance for Multispecialty Research, LLC
    • Texas
      • Austin, Texas, United States, 78731
        • Texas Diabetes & Endocrinology, P.A.
      • Dallas, Texas, United States, 75251
        • Cedar Health Research
      • Dallas, Texas, United States, 75230
        • Velocity Clinical Research, Dallas
      • Dallas, Texas, United States, 75208
        • Thyroid, Endocrinology, and Diabetes
      • Houston, Texas, United States, 77054
        • Juno Research
      • Shavano Park, Texas, United States, 78231
        • Consano Clinical Research, LLC
      • Wylie, Texas, United States, 75098
        • Soma Clinical Trials
    • Utah
      • Draper, Utah, United States, 84020
        • Physicians' Research Options
    • Virginia
      • Newport News, Virginia, United States, 23606
        • Health Research of Hampton Roads, Inc.
    • Washington
      • Redmond, Washington, United States, 98052
        • Eastside Research Associates

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

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Have a BMI

    • ≥30.0 kilogram/square meter (kg/m²),

    • ≥27.0 kg/m² and presence of at least 1 of the following weight-related comorbidities (treated or untreated) at screening:

      • Hypertension, dyslipidemia, obstructive sleep apnea, cardiovascular disease (for example, ischemic cardiovascular disease, New York Heart Association Functional Class I-III heart failure).
  • Have a history of at least 1 self-reported unsuccessful dietary effort to lose body weight.

Exclusion Criteria:

  • Have Type 1 diabetes, Type 2 diabetes, or any other types of diabetes, history of ketoacidosis, or hyperosmolar state/coma
  • Have a self-reported change in body weight >5 kg (11 pounds) within 90 days prior to screening.
  • Have family (first-degree relative) or personal history of medullary thyroid cancer (MTC) or multiple endocrine neoplasia (MEN)2 syndrome.
  • Have had a history of chronic or acute pancreatitis.

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: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Placebo
Participants will be given placebo.
Drug: Placebo
Administered orally.
Experimental: Orforglipron Dose 1
Participants will receive orforglipron administered orally.
Drug: Orforglipron
Administered orally.
Other Names:
  • LY3502970
Experimental: Orforglipron Dose 2
Participants will receive orforglipron administered orally.
Drug: Orforglipron
Administered orally.
Other Names:
  • LY3502970
Experimental: Orforglipron Dose 3
Participants will receive orforglipron administered orally.
Drug: Orforglipron
Administered orally.
Other Names:
  • LY3502970

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Mean Percent Change from Baseline in Body Weight
Time Frame: Baseline to Week 72
Baseline to Week 72

Secondary Outcome Measures

Outcome Measure
Time Frame
Mean Change from Baseline in Waist Circumference
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Change from Baseline in Systolic Blood Pressure (SBP)
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Percent Change from Baseline in Fasting non-HDL Cholesterol
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Percent Change from Baseline in Fasting Triglycerides
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Change from Baseline in Hemoglobin A1c (HbA1c) %
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Change from Baseline in Fasting Glucose
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Percent Change from Baseline in Fasting Insulin
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Change from Baseline in Diastolic Blood Pressure (DBP)
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Change from Baseline in Short Form Version 2 (SF-36v2) Acute Form Domain Scores
Time Frame: Baseline, Week 72
Baseline, Week 72
Mean Percent Change from Baseline in Body Weight in Participants with Prediabetes at Randomization
Time Frame: Baseline, Week 176
Baseline, Week 176
Time to Onset of Type 2 Diabetes
Time Frame: Baseline through Week 176, Baseline through Week 190
Baseline through Week 176, Baseline through Week 190

Collaborators and Investigators

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

Sponsor

Eli Lilly and Company

Investigators

  • Study Director: Call 1-877-CTLILLY (1-877-285-4559) or 1-317-615-4559 Mon - Fri 8 AM - 8 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)

June 5, 2023

Primary Completion (Actual)

July 25, 2025

Study Completion (Estimated)

October 1, 2027

Study Registration Dates

First Submitted

May 12, 2023

First Submitted That Met QC Criteria

May 12, 2023

First Posted (Actual)

May 22, 2023

Study Record Updates

Last Update Posted (Estimated)

November 5, 2025

Last Update Submitted That Met QC Criteria

November 3, 2025

Last Verified

November 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 18559
  • J2A-MC-GZGP (Other Identifier: Eli Lilly and Company)
  • 2022-502839-19-00 (Other Identifier: Eli Lilly and Company)
  • U1111-1289-8877 (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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