Lilly's oral GLP-1, orforglipron, is successful in third Phase 3 trial, triggering global regulatory submissions this year for the treatment of obesity

In ATTAIN-2, orforglipron met the primary and all key secondary endpoints, with compelling efficacy results and a safety profile consistent with injectable GLP-1 medicines

Participants with obesity or overweight and type 2 diabetes, a population with increased difficulties losing weight, lost an average of 22.9 lbs (10.5%) on the highest dose, with A1C reduced by an average of 1.8%

INDIANAPOLIS, Aug. 26, 2025 /PRNewswire/ -- Eli Lilly and Company (NYSE:LLY) today announced positive topline results from the Phase 3 ATTAIN-2 trial, evaluating orforglipron, an investigational oral GLP-1 receptor agonist, in adults with obesity or overweight and type 2 diabetes. In the trial, all three doses of orforglipron met the primary and all key secondary endpoints, delivering significant weight loss, meaningful A1C reductions, and improvements in cardiometabolic risk factors at 72 weeks. For the primary endpoint, orforglipron 36 mg, taken once per day without food and water restrictions, lowered weight by an average of 10.5% (22.9 lbs) compared to 2.2% (5.1 lbs) with placebo using the efficacy estimand.¹ With the completion of ATTAIN-2, Lilly now has the full clinical data package required to initiate global regulatory submissions for orforglipron.

"Based on my experience leading clinical trials in obesity and diabetes, these data show the potential for orforglipron to offer an efficacy, safety, and tolerability profile consistent with the injectable GLP-1 class," said Louis J. Aronne, MD, FACP, DABOM, founder and Chair Emeritus of the American Board of Obesity Medicine, former president of The Obesity Society, Fellow of the American College of Physicians, and world-renowned obesity specialist. "Orforglipron could help health care providers expand treatment options for patients who prefer oral therapies without compromising clinical results."

In the ATTAIN-2 trial, orforglipron met the primary endpoint of superior body weight reduction compared to placebo. Participants taking the highest dose of orforglipron lost an average of 22.9 lbs (10.5%) at 72 weeks using the efficacy estimand. In a key secondary endpoint, orforglipron lowered A1C by 1.3% to 1.8% from a baseline of 8.1% across doses. In another key secondary endpoint, 75% of participants taking the highest dose of orforglipron achieved an A1C ≤6.5%, which is at or below the American Diabetes Association's definition of diabetes.² Additionally, orforglipron showed clinically meaningful benefits across key cardiovascular risk factors, including non-HDL cholesterol, systolic blood pressure and triglycerides. In a pre-specified exploratory analysis, the highest dose of orforglipron reduced high-sensitivity C-reactive protein (hsCRP) levels, a marker of inflammation, by 50.6%.

For the treatment-regimen estimand, each dose of orforglipron led to statistically significant improvements across the primary and all key secondary endpoints, including:^3,4

• Percent weight reduction: -5.1% (-5.3 kg; -11.7 lbs; 6 mg), -7.0% (-7.2 kg; -15.9 lbs; 12 mg), -9.6% (-9.6 kg; -21.2 lbs; 36 mg), -2.5% (-2.7 kg; -6.0 lbs; placebo)
• Percentage of participants achieving body weight reductions of ≥10%: 22.6% (6 mg), 31.2% (12 mg), 45.6% (36 mg), 9.0% (placebo)
• Percentage of participants achieving body weight reductions of ≥15%: 6.8% (6 mg), 14.4% (12 mg), 26.0% (36 mg), 3.0% (placebo)
• A1C reduction: -1.2% (6 mg), -1.5% (12 mg), -1.7% (36 mg), -0.5% (placebo)
• Percentage of participants achieving A1C <7%: 64.6% (6 mg), 75.9% (12 mg), 75.5% (36 mg), 30.5% (placebo)
• Percentage of participants achieving A1C ≤6.5%: 52.5% (6 mg), 57.6% (12 mg), 66.6% (36 mg), 15.4% (placebo)

"The ATTAIN-2 results reinforce the potential for orforglipron, as a once-daily oral, to deliver meaningful weight loss and A1C reduction, consistent with similar landmark trials for injectable GLP-1s," said Kenneth Custer, Ph.D., Lilly executive vice president and president of Lilly Cardiometabolic Health. "With these positive data in hand, we are moving with urgency toward global regulatory submissions to potentially meet the needs of patients who are waiting. If approved, we are ready to offer a convenient, once-daily pill that can be scaled globally — removing barriers and redefining how obesity is treated around the world."

The overall safety profile of orforglipron in ATTAIN-2 was consistent with the established GLP-1 receptor agonist class. The most commonly reported adverse events were gastrointestinal-related and generally mild-to-moderate in severity. The most common adverse events for participants treated with orforglipron (6 mg, 12 mg and 36 mg, respectively) were nausea (20.1%, 31.1% and 36.4%) vs. 8.4% with placebo, vomiting (12.8%, 20.2% and 23.1%) vs. 3.8% with placebo, diarrhea (21.3%, 24.8% and 27.4%) vs. 15.0% with placebo, constipation (17.7%, 21.1% and 22.4%) vs. 7.8% with placebo, and dyspepsia (9.1%, 15.4% and 10.9%) vs. 3.5% with placebo. Treatment discontinuation rates due to adverse events were 6.1% (6 mg), 10.6% (12 mg) and 10.6% (36 mg) for orforglipron vs. 4.6% with placebo. Overall treatment discontinuation rates were balanced across the treatment groups with 19.1% (6 mg), 22.3% (12 mg) and 20.5% (36 mg) for orforglipron vs. 20.0% with placebo. No hepatic safety signal was observed.

Detailed ATTAIN-2 results will be presented at a future medical meeting and published in a peer-reviewed journal.

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.⁵ 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.⁶ 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 and hypertension in adults with obesity.

About ATTAIN-2 and ATTAIN clinical trial program 

ATTAIN-2 (NCT05872620) is a Phase 3, 72-week, randomized, double-blind, placebo-controlled trial comparing the efficacy and safety of orforglipron 6 mg, 12 mg and 36 mg as monotherapy with placebo in adults with obesity or overweight and type 2 diabetes. The trial randomized over 1,600 participants across the U.S., Argentina, Australia, Brazil, China, Czechia, Germany, Greece, India, South Korea and Puerto Rico in a 1:1:1:2 ratio to receive either 6 mg, 12 mg or 36 mg orforglipron or placebo. The primary objective of the study was to demonstrate that orforglipron (6 mg, 12 mg, 36 mg) is superior to placebo in mean body weight change from baseline at 72 weeks in people with a BMI ≥27.0 kg/m² and type 2 diabetes who are on stable treatment with either diet/exercise alone or up to three oral antihyperglycemic medications. All participants receiving orforglipron started the study at a dose of 1 mg once-daily and then increased the dose in a step-wise approach at four-week intervals to their final randomized maintenance dose of 6 mg (via steps at 1 mg and 3 mg), 12 mg (via steps at 1 mg, 3 mg and 6 mg) or 36 mg (via steps at 1 mg, 3 mg, 6 mg, 12 mg and 24 mg). Dose reduction was only allowed for GI tolerability if other mitigations failed.

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

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 72 weeks without initiating prohibited weight management treatments (and glycemic rescue therapy for glycemic endpoints only).
2. American Diabetes Association. (n.d.). Understanding diabetes diagnosis. Diabetes Diagnosis & Tests | ADA. https://diabetes.org/about-diabetes/diagnosis
3. The treatment-regimen estimand represents the estimated average treatment effect regardless of adherence to study intervention or initiation of prohibited weight management treatments (or glycemic rescue therapy for glycemic endpoints only).
4. Superiority test was adjusted for multiplicity with all three doses except for the percentage of participants achieving body weight reduction of ≥15% where multiplicity adjustment applied to the 12 mg and 36 mg doses.
5. 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.
6. 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).

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, Lilly's ability to supply orforglipron, if approved, 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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