Lilly's orforglipron helped people maintain weight loss after switching from injectable incretins to oral GLP-1 therapy in first-of-its-kind Phase 3 trial

In ATTAIN-MAINTAIN, orforglipron achieved the primary and all key secondary endpoints for weight maintenance vs. placebo at 52 weeks following weight loss on Wegovy or Zepbound

Participants who switched to orforglipron from Wegovy maintained all but 0.9 kg of their previously achieved weight loss on average

Lilly has submitted orforglipron to the U.S. Food and Drug Administration for the treatment of obesity

INDIANAPOLIS, Dec. 18, 2025 /PRNewswire/ -- Eli Lilly and Company (NYSE:LLY) today announced positive topline results from the ATTAIN-MAINTAIN trial. The Phase 3 study evaluated orforglipron, an investigational, once-daily oral small molecule glucagon-like peptide-1 (GLP-1) receptor agonist, for weight maintenance over 52 weeks after initial treatment for 72 weeks with the highest tolerated doses of Wegovy (semaglutide) or Zepbound (tirzepatide), in participants from SURMOUNT-5 who were offered the opportunity to be re-randomized to receive orforglipron or placebo. At one year, orforglipron met the primary and all key secondary endpoints compared to placebo, delivering superior weight maintenance as an adjunct to a healthy diet and physical activity, using the efficacy estimand and modified treatment-regimen estimand.^1,2

"Obesity is a chronic, progressive disease, and sustaining weight loss remains a significant challenge for many," said Kenneth Custer, Ph.D., executive vice president and president, Lilly Cardiometabolic Health. "ATTAIN‑MAINTAIN showed that orforglipron, a once-daily oral GLP-1, helped people maintain the weight they worked hard to lose. Participants in this study were able to switch directly from the highest tolerated doses of available injectable therapies onto oral doses of orforglipron. If approved for the treatment of obesity, orforglipron could provide a convenient alternative for the millions of individuals living with obesity around the globe to continue their long-term health journey."

In the study, orforglipron met the primary endpoint of superior percent maintenance of body weight reduction compared to placebo, among SURMOUNT-5 participants who previously reached a body weight plateau. In pre-specified analyses at 52 weeks, participants who switched to orforglipron from Wegovy maintained their previously achieved weight loss with an average difference of 0.9 kg, while those who switched to orforglipron from Zepbound maintained their previously achieved weight loss with an average difference of 5.0 kg, using the efficacy estimand. In post-hoc analyses at 24 weeks, the last time point before placebo participants were eligible for orforglipron as rescue therapy, the change in body weight from ATTAIN-MAINTAIN baseline for patients switching to orforglipron from Wegovy was -0.1 kg vs. 9.4 kg for placebo. Likewise, for patients switching to orforglipron from Zepbound, the change from baseline was 2.6 kg vs. 9.1 kg for placebo.

The overall safety and tolerability profile of orforglipron in ATTAIN-MAINTAIN was consistent with previous orforglipron Phase 3 studies. The most common adverse events were gastrointestinal-related and generally mild-to-moderate in severity. Discontinuation rates due to adverse events for patients randomized to placebo or orforglipron were 4.8% (orforglipron from Wegovy), 7.6% (placebo from Wegovy), 7.2% (orforglipron from Zepbound) and 6.3% (placebo from Zepbound). No hepatic safety signal was observed.

Detailed results from the ATTAIN-MAINTAIN trial will be presented at a future medical meeting and published in a peer-reviewed journal next year. Lilly has submitted a new drug application to the U.S. Food and Drug Administration (FDA) for orforglipron for the treatment of adults with obesity or overweight. Orforglipron was granted a Commissioner's National Priority Voucher from the U.S. FDA.

About orforglipron

Orforglipron (or-for-GLIP-ron) is an investigational, once-daily small molecule (non-peptide) oral glucagon-like peptide-1 receptor agonist that can be taken any time of the day without restrictions on food and water intake.³ Orforglipron was discovered by Chugai Pharmaceutical Co., Ltd. and licensed by Lilly in 2018. Chugai and Lilly published the preclinical pharmacology data of this molecule together.⁴ Lilly is running Phase 3 studies on orforglipron for the treatment of type 2 diabetes and for weight management in adults with obesity or overweight with at least one weight-related medical problem. It is also being studied as a potential treatment for obstructive sleep apnea, hypertension, and knee osteoarthritis in adults with obesity, as well as stress urinary incontinence and cardiovascular and renal outcomes.

About ATTAIN-MAINTAIN trial and ATTAIN clinical trial program

ATTAIN-MAINTAIN (NCT06584916) was a 52-week, Phase 3, randomized, double-blind, placebo-controlled trial comparing the efficacy and safety of once-daily orforglipron versus placebo for maintenance of body weight reduction in adults with obesity or overweight with weight-related comorbidities who previously completed the SURMOUNT-5 head-to-head trial. The ATTAIN-MAINTAIN trial randomized 376 participants across the U.S. in a 3:2 ratio to receive either orforglipron maximum tolerated dose (MTD; 24 mg or 36 mg) or placebo, as an adjunct to healthy diet and physical activity.

The primary endpoint was to demonstrate that orforglipron is superior to placebo in the maintenance of body weight reduction in participants who achieved plateau with either Zepbound or Wegovy in the SURMOUNT-5 trial. Weight plateau was defined as <5% body weight change between weeks 60 and 72 in SURMOUNT-5. In ATTAIN-MAINTAIN, participants were randomized to a 12 mg dose of once-daily, oral orforglipron (or matching placebo) which was increased every 4 weeks until the randomized maintenance dose of 36 mg or MTD (24 mg or 36 mg) was reached. All participants who regained 50% or more of their body weight from SURMOUNT-5 were treated with rescue orforglipron MTD therapy in this novel, patient-centric approach to clinical trial design.

The ATTAIN Phase 3 global clinical development program for orforglipron has enrolled more than 4,500 people with obesity or overweight across two global registrational trials.

About SURMOUNT-5

SURMOUNT-5 (NCT05822830) was a 72-week, multi-center, randomized, open-label, Phase 3b trial evaluating the efficacy and safety of Zepbound (tirzepatide) compared with Wegovy (semaglutide) in adults with obesity, or overweight with at least one of the following comorbidities: hypertension, dyslipidemia, obstructive sleep apnea (OSA) or cardiovascular disease, who did not have diabetes. Participants in both treatment groups received counseling on a reduced-calorie diet and increased physical activity. The trial randomized 751 participants across the U.S. and Puerto Rico in a 1:1 ratio to receive maximum tolerated dose of Zepbound (10 mg or 15 mg) or Wegovy (1.7 mg or 2.4 mg). With Zepbound, 89.3% received at least one dose of the 15 mg dose and with Wegovy 92.8% received at least one dose of the 2.4 mg dose. The primary objective of the study was to demonstrate Zepbound's superiority in percentage change from baseline in body weight at 72 weeks compared to Wegovy. In the SURMOUNT-5 trial, participants treated with Zepbound achieved an average weight reduction of 20.2% compared to 13.7% with Wegovy at 72 weeks.

About tirzepatide

Tirzepatide is a once-weekly dual GIP (glucose-dependent insulinotropic polypeptide) receptor and GLP-1 (glucagon-like peptide-1) receptor agonist. Tirzepatide is a single molecule that activates the body's receptors for GIP and GLP-1, which are natural incretin hormones. Both GIP and GLP-1 receptors are found in areas of the human brain important for appetite regulation. Tirzepatide decreases calorie intake, and the effects are likely mediated by affecting appetite. Studies of tirzepatide in chronic kidney disease (CKD) and in morbidity/mortality in obesity (MMO) are ongoing.

Tirzepatide has been approved by the U.S. FDA as Mounjaro for adults with type 2 diabetes to improve glycemic control, and as Zepbound for adults with obesity, or some adults who are overweight and also have at least one weight-related medical problem, to lose weight and keep it off. Additionally, Zepbound is FDA-approved to treat adults with moderate-to-severe obstructive sleep apnea and obesity. Tirzepatide is also approved as Mounjaro in some countries outside the U.S. for adults with type 2 diabetes, obesity or those who are overweight who also have a weight-related comorbid condition. Both Mounjaro and Zepbound should be used in combination with diet and exercise.

Endnotes and References

1. The efficacy estimand represents efficacy had all randomized participants remained on study intervention (with possible dose interruptions and/or dose modifications) for 52 weeks without initiating prohibited weight management treatments, and assuming participants who took rescue orforglipron would not have received any additional improvement from their randomized study treatment.
2. The modified treatment-regimen estimand represents the estimated average treatment effect regardless of adherence to study intervention or initiation of prohibited weight management treatments, and assuming participants who took rescue orforglipron would not have received any additional improvement from their randomized study treatment.
3. Ma X, Liu R, Pratt EJ, Benson CT, Bhattachar SN, Sloop KW. Effect of Food Consumption on the Pharmacokinetics, Safety, and Tolerability of Once-Daily Orally Administered Orforglipron (LY3502970), a Non-peptide GLP-1 Receptor Agonist. Diabetes Ther. 2024 Apr;15(4):819-832. doi: 10.1007/s13300-024-01554-1. Epub 2024 Feb 24. PMID: 38402332; PMCID: PMC10951152.
4. T. Kawai, B. Sun, H. Yoshino, D. Feng, Y. Suzuki, M. Fukazawa, S. Nagao, D.B. Wainscott, A.D. Showalter, B.A. Droz, T.S. Kobilka, M.P. Coghlan, F.S. Willard, Y. Kawabe, B.K. Kobilka, & K.W. Sloop, Structural basis for GLP-1 receptor activation by LY3502970, an orally active nonpeptide agonist, Proc. Natl. Acad. Sci. U.S.A. 117 (47) 29959-29967, https://doi.org/10.1073/pnas.2014879117 (2020).

ZEPBOUND INDICATIONS AND SAFETY SUMMARY WITH WARNINGS

Zepbound® (ZEHP-bownd) is an injectable prescription medicine that may help adults with:

• obesity, or some adults with overweight who also have weight-related medical problems to lose excess body weight and keep the weight off.
• moderate-to-severe obstructive sleep apnea (OSA) and obesity to improve their OSA.

It should be used with a reduced-calorie diet and increased physical activity.

Zepbound contains tirzepatide and should not be used with other tirzepatide-containing products or any GLP-1 receptor agonist medicines. It is not known if Zepbound is safe and effective for use in children.

Warnings - Zepbound may cause tumors in the thyroid, including thyroid cancer. Watch for possible symptoms, such as a lump or swelling in the neck, hoarseness, trouble swallowing, or shortness of breath. If you have any of these symptoms, tell your healthcare provider.

• Do not use Zepbound if you or any of your family have ever had a type of thyroid cancer called medullary thyroid carcinoma (MTC).
• Do not use Zepbound if you have Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
• Do not use Zepbound if you have had a serious allergic reaction to tirzepatide or any of the ingredients in Zepbound.

Zepbound may cause serious side effects, including:

Severe stomach problems. Stomach problems, sometimes severe, have been reported in people who use Zepbound. Tell your healthcare provider if you have stomach problems that are severe or will not go away.

Dehydration leading to kidney problems. Diarrhea, nausea, and vomiting may cause a loss of fluids (dehydration), which may cause kidney problems. It is important for you to drink fluids to help reduce your chance of dehydration.

Gallbladder problems. Gallbladder problems have happened in some people who use Zepbound. Tell your healthcare provider right away if you get symptoms of gallbladder problems, which may include pain in your upper stomach (abdomen), fever, yellowing of skin or eyes (jaundice), or clay-colored stools.

Inflammation of the pancreas (pancreatitis). Stop using Zepbound and call your healthcare provider right away if you have severe pain in your stomach area (abdomen) that will not go away, with or without vomiting. You may feel the pain from your abdomen to your back.

Serious allergic reactions. Stop using Zepbound and get medical help right away if you have any symptoms of a serious allergic reaction, including swelling of your face, lips, tongue or throat, problems breathing or swallowing, severe rash or itching, fainting or feeling dizzy, or very rapid heartbeat.

Low blood sugar (hypoglycemia). Your risk for getting low blood sugar may be higher if you use Zepbound with medicines that can cause low blood sugar, such as a sulfonylurea or insulin. Signs and symptoms of low blood sugar may include dizziness or light-headedness, sweating, confusion or drowsiness, headache, blurred vision, slurred speech, shakiness, fast heartbeat, anxiety, irritability, mood changes, hunger, weakness or feeling jittery.

Changes in vision in patients with type 2 diabetes. Tell your healthcare provider if you have changes in vision during treatment with Zepbound.

Depression or thoughts of suicide. You should pay attention to changes in your mood, behaviors, feelings or thoughts. Call your healthcare provider right away if you have any mental changes that are new, worse, or worry you.

Food or liquid getting into the lungs during surgery or other procedures that use anesthesia or deep sleepiness (deep sedation). Zepbound may increase the chance of food getting into your lungs during surgery or other procedures. Tell all your healthcare providers that you are taking Zepbound before you are scheduled to have surgery or other procedures.

Common side effects

The most common side effects of Zepbound include nausea, diarrhea, vomiting, constipation, stomach (abdominal) pain, indigestion, injection site reactions, feeling tired, allergic reactions, belching, hair loss, and heartburn. These are not all the possible side effects of Zepbound. Talk to your healthcare provider about any side effect that bothers you or doesn't go away.

Tell your doctor if you have any side effects. You can report side effects at 1-800-FDA-1088 or www.fda.gov/medwatch.

Before using Zepbound

• Your healthcare provider should show you how to use Zepbound before you use it for the first time.
• Talk to your healthcare provider about low blood sugar and how to manage it. Tell your healthcare provider if you are taking medicines to treat diabetes including an insulin or sulfonylurea.
• If you take birth control pills by mouth, talk to your healthcare provider before you use Zepbound. Birth control pills may not work as well while using Zepbound. Your healthcare provider may recommend another type of birth control for 4 weeks after you start Zepbound and for 4 weeks after each increase in your dose of Zepbound.

Review these questions with your healthcare provider:

❑ Do you have other medical conditions, including problems with your pancreas, or severe problems with your stomach, such as slowed emptying of your stomach (gastroparesis) or problems digesting food?

❑ Do you take other diabetes medicines, such as insulin or sulfonylureas?

❑ Do you have a history of diabetic retinopathy?

❑ Are you scheduled to have surgery or other procedures that use anesthesia or deep sleepiness (deep sedation)?

❑ Do you take any other prescription medicines or over-the-counter drugs, vitamins, or herbal supplements?

❑ Are you pregnant, plan to become pregnant, breastfeeding, or plan to breastfeed? Zepbound may harm your unborn baby. Tell your healthcare provider if you become pregnant while using Zepbound. Zepbound may pass into your breast milk. You should talk with your healthcare provider about the best way to feed your baby while using Zepbound.

• Pregnancy Exposure Registry: There will be a pregnancy exposure registry for women who have taken Zepbound during pregnancy. The purpose of this registry is to collect information about the health of you and your baby. Talk to your healthcare provider about how you can take part in this registry, or you may contact Lilly at 1-800-LillyRx (1-800-545-5979).

How to take

• Read the Instructions for Use that come with Zepbound.
• Use Zepbound exactly as your healthcare provider says.
• Use Zepbound with a reduced-calorie diet and increased physical activity.
• Inject Zepbound under the skin (subcutaneously) of your stomach (abdomen), thigh, or have another person inject in the back of the upper arm. Do not inject ZEPBOUND into a muscle (intramuscularly) or vein (intravenously).
• Use Zepbound 1 time each week, at any time of the day.
• Change (rotate) your injection site with each weekly injection. Do not use the same site for each injection.
• If you take too much Zepbound, call your healthcare provider, call the Poison Help line at 1-800-222-1222 or go to the nearest hospital emergency room right away.

Zepbound injection is approved as a 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, or 15 mg per 0.5 mL in single-dose pen or single-dose vial.

Learn more

Zepbound is a prescription medicine. For more information, call 1-800-LillyRx (1-800-545-5979) or go to www.zepbound.lilly.com.

This summary provides basic information about Zepbound but does not include all information known about this medicine. Read the information that comes with your prescription each time your prescription is filled. This information does not take the place of talking with your healthcare provider. Be sure to talk to your healthcare provider about Zepbound and how to take it. Your healthcare provider is the best person to help you decide if Zepbound is right for you.



ZP CON BS 25SEP2025

Zepbound® and its delivery device base are registered trademarks owned or licensed by Eli Lilly and Company, its subsidiaries, or affiliates.

MOUNJARO INDICATION AND SAFETY SUMMARY WITH WARNINGS

Mounjaro® (mown-JAHR-OH) is an injectable medicine for adults with type 2 diabetes used along with diet and exercise to improve blood sugar (glucose).

• It is not known if Mounjaro is safe and effective for use in children.

Warnings - Mounjaro may cause tumors in the thyroid, including thyroid cancer. Watch for possible symptoms, such as a lump or swelling in the neck, hoarseness, trouble swallowing, or shortness of breath. If you have any of these symptoms, tell your healthcare provider.

• Do not use Mounjaro if you or any of your family have ever had a type of thyroid cancer called medullary thyroid carcinoma (MTC).
• Do not use Mounjaro if you have Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
• Do not use Mounjaro if you are allergic to it or any of the ingredients in Mounjaro.

Mounjaro may cause serious side effects, including:

Inflammation of the pancreas (pancreatitis). Stop using Mounjaro and call your healthcare provider right away if you have severe pain in your stomach area (abdomen) that will not go away, with or without vomiting. You may feel the pain from your abdomen to your back.

Low blood sugar (hypoglycemia). Your risk for getting low blood sugar may be higher if you use Mounjaro with another medicine that can cause low blood sugar, such as a sulfonylurea or insulin. Signs and symptoms of low blood sugar may include dizziness or light-headedness, sweating, confusion or drowsiness, headache, blurred vision, slurred speech, shakiness, fast heartbeat, anxiety, irritability, or mood changes, hunger, weakness and feeling jittery.

Serious allergic reactions. Stop using Mounjaro and get medical help right away if you have any symptoms of a serious allergic reaction, including swelling of your face, lips, tongue or throat, problems breathing or swallowing, severe rash or itching, fainting or feeling dizzy, and very rapid heartbeat.

Dehydration leading to kidney problems. Diarrhea, nausea, and vomiting may cause a loss of fluids (dehydration), which may cause kidney problems. It is important for you to drink fluids to help reduce your chance of dehydration.

Severe stomach problems. Stomach problems, sometimes severe, have been reported in people who use Mounjaro. Tell your healthcare provider if you have stomach problems that are severe or will not go away.

Changes in vision. Tell your healthcare provider if you have changes in vision during treatment with Mounjaro.

Gallbladder problems. Gallbladder problems have happened in some people who use Mounjaro. Tell your healthcare provider right away if you get symptoms of gallbladder problems, which may include pain in your upper stomach (abdomen), fever, yellowing of skin or eyes (jaundice), and clay-colored stools.

Food or liquid getting into the lungs during surgery or other procedures that use anesthesia or deep sleepiness (deep sedation). Mounjaro may increase the chance of food getting into your lungs during surgery or other procedures. Tell all your healthcare providers that you are taking Mounjaro before you are scheduled to have surgery or other procedures.

Common side effects

The most common side effects of Mounjaro include nausea, diarrhea, decreased appetite, vomiting, constipation, indigestion, and stomach (abdominal) pain. These are not all the possible side effects of Mounjaro. Talk to your healthcare provider about any side effect that bothers you or doesn't go away.

Tell your healthcare provider if you have any side effects. You can report side effects at 1-800-FDA-1088 or www.fda.gov/medwatch.

Before using Mounjaro

• Your healthcare provider should show you how to use Mounjaro before you use it for the first time.
• Talk to your healthcare provider about low blood sugar and how to manage it.
• If you take birth control pills by mouth, talk to your healthcare provider before you use Mounjaro. Birth control pills may not work as well while using Mounjaro. Your healthcare provider may recommend another type of birth control for 4 weeks after you start Mounjaro and for 4 weeks after each increase in your dose of Mounjaro.

Review these questions with your healthcare provider:

❑ Do you have other medical conditions, including problems with your pancreas, or severe problems with your stomach, such as slowed emptying of your stomach (gastroparesis) or problems digesting food?

❑ Do you take other diabetes medicines, such as insulin or sulfonylureas?

❑ Do you have a history of diabetic retinopathy?

❑ Are you scheduled to have surgery or other procedures that use anesthesia or deep sleepiness (deep sedation)?

❑ Are you pregnant, plan to become pregnant, breastfeeding, or plan to breastfeed? It is not known if Mounjaro will harm your unborn baby. Mounjaro may pass into your breast milk.

❑ Do you take any other prescription medicines or over-the-counter drugs, vitamins, or herbal supplements?

How to take

• Read the Instructions for Use that come with Mounjaro.
• Use Mounjaro exactly as your healthcare provider says.
• Inject Mounjaro under the skin (subcutaneously) of your stomach (abdomen), thigh, or another person should inject in the back of your upper arm. Do not inject Mounjaro into a muscle (intramuscularly) or vein (intravenously).
• Use Mounjaro 1 time each week, at any time of the day.
• Do not mix insulin and Mounjaro together in the same injection.
• You may give an injection of Mounjaro and insulin in the same body area (such as your stomach area), but not right next to each other.
• Change (rotate) your injection site with each weekly injection. Do not use the same site for each injection.
• If you take too much Mounjaro, call your healthcare provider or Poison Help line at 1-800-222-1222 or go to the nearest hospital emergency room right away.

Learn more

Mounjaro is a prescription medicine available as a pre-filled single-dose pen in 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, or 15 mg per 0.5 mL injection. For more information, call 1-800-LillyRX (800-545-5979) or go to www.mounjaro.lilly.com.

This summary provides basic information about Mounjaro but does not include all information known about this medicine. Read the information that comes with your prescription each time your prescription is filled. This information does not take the place of talking with your healthcare provider. Be sure to talk to your healthcare provider about Mounjaro and how to take it. Your healthcare provider is the best person to help you decide if Mounjaro is right for you.



TR CON CBS 01OCT2025

Mounjaro® and its delivery device base are registered trademarks owned or licensed by Eli Lilly and Company, its subsidiaries, or affiliates.

About Lilly

Lilly is a medicine company turning science into healing to make life better for people around the world. We've been pioneering life-changing discoveries for nearly 150 years, and today our medicines help tens of millions of people across the globe. Harnessing the power of biotechnology, chemistry and genetic medicine, our scientists are urgently advancing new discoveries to solve some of the world's most significant health challenges: redefining diabetes care; treating obesity and curtailing its most devastating long-term effects; advancing the fight against Alzheimer's disease; providing solutions to some of the most debilitating immune system disorders; and transforming the most difficult-to-treat cancers into manageable diseases. With each step toward a healthier world, we're motivated by one thing: making life better for millions more people. That includes delivering innovative clinical trials that reflect the diversity of our world and working to ensure our medicines are accessible and affordable. To learn more, visit Lilly.com and Lilly.com/news, or follow us on Facebook, Instagram and LinkedIn. P-LLY

Cautionary Statement Regarding Forward-Looking Statements

This press release contains forward-looking statements (as that term is defined in the Private Securities Litigation Reform Act of 1995) about orforglipron as a potential treatment for adults with obesity or overweight, regulatory submission and action timing, and the timeline for future readouts, presentations, and other milestones relating to orforglipron and its clinical trials and reflects Lilly's current beliefs and expectations. However, as with any pharmaceutical product, there are substantial risks and uncertainties in the process of drug research, development, and commercialization. Among other things, there is no guarantee that planned or ongoing studies will be completed as planned, that future study results will be consistent with study results to date, that orforglipron will prove to be a safe and effective treatment for obesity or overweight, that orforglipron will receive regulatory approval, or that Lilly will execute its strategy as expected. For further discussion of these and other risks and uncertainties that could cause actual results to differ from Lilly's expectations, see Lilly's Form 10-K and Form 10-Q filings with the United States Securities and Exchange Commission. Except as required by law, Lilly undertakes no duty to update forward-looking statements to reflect events after the date of this release.

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All trademarks or trade names referred to in this press release are the property of the company, or, to the extent trademarks or trade names belonging to other companies are references in this press release, the property of their respective owners. Solely for convenience, the trademarks and trade names in this press release are referred to without the ® and ™ symbols, but such references should not be construed as any indicator that the company or, to the extent applicable, their respective owners will not assert, to the fullest extent under applicable law, the company's or their rights thereto. We do not intend the use or display of other companies' trademarks and trade names to imply a relationship with, or endorsement or sponsorship of us by, any other companies.

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