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Lilly's oral GLP-1, orforglipron, delivers weight loss of up to an average of 27.3 lbs in first of two pivotal Phase 3 trials in adults with obesity

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Eli Lilly (NYSE:LLY) announced positive Phase 3 ATTAIN-1 trial results for orforglipron, its investigational oral GLP-1 receptor agonist, in treating obesity. The once-daily pill demonstrated significant weight loss, with participants taking the highest dose (36mg) losing an average of 27.3 lbs (12.4%) compared to 2.2 lbs (0.9%) with placebo over 72 weeks.

The trial, involving 3,127 adults, met all primary and secondary endpoints. At the highest dose, 59.6% of participants lost �10% body weight, and 39.6% lost �15%. The drug also showed improvements in cardiovascular risk markers, including a 47.7% reduction in hsCRP levels. The safety profile aligned with injectable GLP-1 therapies, with mainly gastrointestinal side effects.

Lilly plans to submit orforglipron for regulatory review by year-end and is preparing for a global launch.

Eli Lilly (NYSE:LLY) ha annunciato risultati positivi della fase 3 dello studio ATTAIN-1 per orforglipron, il suo agonista orale del recettore GLP-1 in fase di sperimentazione per il trattamento dell'obesità. La compressa da assumere una volta al giorno ha mostrato una perdita di peso significativa, con i partecipanti che hanno assunto la dose più alta (36 mg) che hanno perso in media 27,3 libbre (12,4%) rispetto a 2,2 libbre (0,9%) con il placebo in 72 settimane.

Lo studio, che ha coinvolto 3.127 adulti, ha raggiunto tutti gli endpoint primari e secondari. Alla dose più alta, il 59,6% dei partecipanti ha perso �10% del peso corporeo e il 39,6% ha perso �15%. Il farmaco ha anche mostrato miglioramenti nei marcatori di rischio cardiovascolare, inclusa una riduzione del 47,7% dei livelli di hsCRP. Il profilo di sicurezza è risultato in linea con le terapie GLP-1 iniettabili, con effetti collaterali principalmente gastrointestinali.

Lilly prevede di presentare orforglipron per la revisione regolatoria entro la fine dell'anno e si sta preparando per un lancio globale.

Eli Lilly (NYSE:LLY) anunció resultados positivos del ensayo de fase 3 ATTAIN-1 para orforglipron, su agonista oral del receptor GLP-1 en investigación para el tratamiento de la obesidad. La píldora de una vez al día demostró una pérdida de peso significativa, con participantes que tomaron la dosis más alta (36 mg) perdiendo un promedio de 27,3 libras (12,4%) en comparación con 2,2 libras (0,9%) con placebo durante 72 semanas.

El ensayo, que involucró a 3.127 adultos, cumplió con todos los objetivos primarios y secundarios. En la dosis más alta, el 59,6% de los participantes perdió �10% del peso corporal y el 39,6% perdió �15%. El medicamento también mostró mejoras en los marcadores de riesgo cardiovascular, incluyendo una reducción del 47,7% en los niveles de hsCRP. El perfil de seguridad fue consistente con las terapias inyectables de GLP-1, con efectos secundarios principalmente gastrointestinales.

Lilly planea presentar orforglipron para revisión regulatoria antes de fin de año y se está preparando para un lanzamiento global.

Eli Lilly (NYSE:LLY)� 비만 치료� 위한 경구� GLP-1 수용� 작용제인 orforglipron� 3� ATTAIN-1 임상시험에서 긍정적인 결과� 발표했습니다. 하루 � � 복용하는 � 약은 가� 높은 용량(36mg)� 복용� 참가자들� 72� 동안 평균 27.3파운�(12.4%)� 체중 감소� 보였으며, 위약군은 2.2파운�(0.9%) 감소� 그쳤습니�.

3,127명의 성인� 참여� 이번 임상시험은 모든 주요 � 부차적 목표� 달성했습니다. 가� 높은 용량에서� 59.6%� 참가자가 체중� �10%� 감량했으�, 39.6%� �15%� 감량했습니다. 또한 � 약물은 hsCRP 수치� 47.7% 감소시키� � 심혈관 위험 지� 개선� 나타냈습니다. 안전� 프로필은 주사� GLP-1 치료제와 유사하며, 주로 위장 관� 부작용� 보고되었습니�.

Lilly� 연말까지 orforglipron� 규제 심사� 제출� 계획이며, 글로벌 출시 준비를 진행 중입니다.

Eli Lilly (NYSE:LLY) a annoncé des résultats positifs de l'essai de phase 3 ATTAIN-1 pour l'orforglipron, son agoniste oral du récepteur GLP-1 en cours d'investigation pour le traitement de l'obésité. Ce comprimé à prise quotidienne a démontré une perte de poids significative, les participants ayant pris la dose la plus élevée (36 mg) perdant en moyenne 27,3 livres (12,4%) contre 2,2 livres (0,9%) avec le placebo sur 72 semaines.

L'essai, impliquant 3 127 adultes, a atteint tous les critères principaux et secondaires. À la dose la plus élevée, 59,6% des participants ont perdu �10% de leur poids corporel, et 39,6% ont perdu �15%. Le médicament a également montré des améliorations des marqueurs de risque cardiovasculaire, y compris une réduction de 47,7% des niveaux de hsCRP. Le profil de sécurité était conforme à celui des thérapies injectables GLP-1, avec principalement des effets secondaires gastro-intestinaux.

Lilly prévoit de soumettre l'orforglipron pour examen réglementaire d'ici la fin de l'année et se prépare à un lancement mondial.

Eli Lilly (NYSE:LLY) gab positive Ergebnisse der Phase-3-Studie ATTAIN-1 für orforglipron bekannt, einen oralen GLP-1-Rezeptoragonisten in der Erforschung zur Behandlung von Adipositas. Die einmal täglich einzunehmende Tablette zeigte eine signifikante Gewichtsabnahme, wobei Teilnehmer, die die höchste Dosis (36 mg) erhielten, im Durchschnitt 27,3 Pfund (12,4%) verloren, verglichen mit 2,2 Pfund (0,9%) in der Placebogruppe über 72 Wochen.

Die Studie mit 3.127 Erwachsenen erreichte alle primären und sekundären Endpunkte. Bei der höchsten Dosis verloren 59,6% der Teilnehmer �10% ihres Körpergewichts, und 39,6% verloren �15%. Das Medikament zeigte zudem Verbesserungen bei kardiovaskulären Risikomarkern, darunter eine 47,7% Reduktion der hsCRP-Werte. Das Sicherheitsprofil entsprach dem von injizierbaren GLP-1-Therapien, mit überwiegend gastrointestinalen Nebenwirkungen.

Lilly plant, orforglipron bis Jahresende zur behördlichen Prüfung einzureichen und bereitet sich auf eine weltweite Markteinführung vor.

Positive
  • Significant weight loss of 27.3 lbs (12.4%) achieved with highest dose vs 2.2 lbs with placebo
  • 59.6% of participants on highest dose lost �10% body weight, 39.6% lost �15%
  • Improvements in cardiovascular risk markers, including 47.7% reduction in hsCRP levels
  • Once-daily oral administration without food/water restrictions offers convenience over injectables
  • Regulatory submission planned by year-end, indicating confidence in results
Negative
  • Higher treatment discontinuation rates due to adverse events (10.3% at highest dose vs 2.6% placebo)
  • Significant gastrointestinal side effects reported (33.7% nausea, 25.4% constipation at highest dose)
  • Overall discontinuation rate of 24.4% at highest dose indicates tolerability challenges

Insights

Lilly's oral GLP-1 achieves impressive 27.3 lb weight loss in Phase 3, potentially disrupting injectable dominance with convenient pill format.

Lilly's Phase 3 ATTAIN-1 trial results for oral GLP-1 receptor agonist orforglipron represent a significant breakthrough in obesity treatment. The highest dose (36mg) achieved an impressive 12.4% weight reduction (27.3 lbs) versus 0.9% with placebo at 72 weeks. This places orforglipron's efficacy in the same league as injectable GLP-1s, but in a more convenient daily pill format without food/water restrictions.

The dose-dependent response across the three tested doses (6mg, 12mg, and 36mg) demonstrates robust clinical validity. Nearly 60% of participants on the highest dose lost �10% of body weight, while nearly 40% achieved the clinically meaningful threshold of �15% weight reduction. These response rates rival injectable competitors while potentially offering better adherence through oral administration.

The results also show cardiometabolic benefits beyond weight loss, with improvements in non-HDL cholesterol, triglycerides, systolic blood pressure, and a 47.7% reduction in hsCRP (inflammation marker). These additional benefits strengthen orforglipron's value proposition for payers and prescribers.

The safety profile aligns with the GLP-1 class, primarily gastrointestinal side effects like nausea (28.9-35.9%), constipation (21.7-29.8%), and vomiting (13-24%) versus much lower rates with placebo. Treatment discontinuation due to adverse events was dose-dependent (5.1-10.3%), but overall discontinuation rates were actually lower than placebo, suggesting good tolerability despite GI events.

With regulatory submissions planned by year-end and Lilly making "substantial investments" for anticipated demand, orforglipron could potentially launch in late 2026, disrupting the rapidly growing obesity market currently dominated by injectables.

The Phase 3 ATTAIN-1 results for Lilly's oral GLP-1 orforglipron represent a potential market inflection point in the obesity treatment landscape. The oral administration route eliminates a key barrier to widespread adoption that currently exists with injectable GLP-1s like Wegovy and Zepbound, potentially expanding the addressable patient population significantly.

With obesity affecting over one billion people globally, the market opportunity is enormous. The efficacy demonstrated (up to 12.4% weight loss) positions orforglipron competitively against injectable options, which typically deliver 15-20% weight loss. While slightly less effective than injectables, the convenience factor of a daily pill could drive greater patient acceptance, adherence, and market penetration.

Lilly's statement about making "substantial investments to meet anticipated demand" signals their confidence in orforglipron becoming a blockbuster therapy. This investment strategy reflects lessons learned from the supply constraints that hampered the launches of Wegovy and Zepbound.

The cardiovascular risk marker improvements (non-HDL cholesterol, triglycerides, blood pressure, and hsCRP) strengthen the drug's value proposition to payers, potentially supporting favorable reimbursement decisions. These markers correlate with reduced long-term healthcare costs from obesity-related comorbidities.

While the gastrointestinal side effect profile mirrors injectable GLP-1s, the overall discontinuation rates (21.9-24.4%) were lower than placebo (29.9%), suggesting patients may find the risk-benefit profile acceptable. This could translate to better long-term adherence, enhancing real-world effectiveness compared to the clinical trial setting.

With planned regulatory submissions by year-end, Lilly appears positioned to potentially capture significant market share in what has become one of the pharmaceutical industry's fastest-growing therapeutic areas.

In ATTAIN-1, the investigational once-daily oral pill showed significant efficacy, and a safety and tolerability profile consistent with injectable GLP-1 therapies at 72 weeks

Orforglipron achieved the primary and all key secondary endpoints, including demonstrating improvements in a number of cardiovascular risk factors

With these results, Lilly is on track to submit orforglipron to global regulatory agencies by year-end and is making substantial investments to meet anticipated demand at launch

INDIANAPOLIS, Aug. 7, 2025 /PRNewswire/ -- Eli Lilly and Company (NYSE: LLY) today announced positive topline results from the Phase 3 ATTAIN-1 trial, evaluating orforglipron, an investigational oral glucagon-like peptide-1 (GLP-1) receptor agonist, in 3,127 adults with obesity, or overweight with a weight-related medical problem and without diabetes. At 72 weeks, all three doses of orforglipron, met the primary endpoint and all key secondary endpoints compared to placebo, delivering clinically meaningful weight loss as an adjunct to a healthy diet and physical activity. For the primary endpoint, orforglipron 36 mg, taken once per day without food and water restrictions, lowered weight by an average of 12.4% (27.3 lbs) compared to 0.9% (2.2 lbs) with placebo using the efficacy estimand.1

"Obesity is one of the most pressing global health challenges of our time, driving global chronic disease burden and impacting more than one billion people worldwide," said Kenneth Custer, Ph.D., executive vice president and president of Lilly Cardiometabolic Health. "With orforglipron, we're working to transform obesity care by introducing a potential once-daily oral therapy that could support early intervention and long-term disease management, while offering a convenient alternative to injectable treatments. With these positive data in hand, we are now planning to submit orforglipron for regulatory review by year-end and are prepared for a global launch to address this urgent public health need."

In the ATTAIN-1 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 27.3 lbs (12.4%) at 72 weeks using the efficacy estimand. In a key secondary endpoint, 59.6% of participants taking the highest dose of orforglipron lost at least 10% of their body weight, while 39.6% lost at least 15% of their body weight. In addition to achieving significant weight loss, orforglipron was also associated with reductions in known markers of cardiovascular risk, including non-HDL cholesterol, triglycerides and systolic blood pressure in pooled analyses across all doses. In a pre-specified exploratory analysis, the highest dose of orforglipron reduced high-sensitivity C-reactive protein (hsCRP) levels by 47.7%.

Efficacy Estimand Results


Orforglipron

6 mg

Orforglipron

12 mg

Orforglipron

36 mg

Placebo

Primary Endpoint

Mean percent change in
body weight from avg.
baseline of 103.2 kg
(227.5 lbs) and 37.0 BMIi

-7.8%

(-8.0 kg; -17.6 lbs)

-9.3%

(-9.4 kg; -20.7 lbs)

-12.4%

(-12.4 kg; -27.3 lbs)

-0.9%

(-1.0 kg; -2.2 lbs)

Key Secondary Endpoints

Percentage of
participants achieving
body weight reductions
of �10%i

35.9%

45.1%

59.6%

8.6%

Percentage of
participants achieving
body weight reductions
of �15%i

16.5%

24.0%

39.6%

3.6%

iSuperiority test was adjusted for multiplicity.

For the treatment-regimen estimand,2 each dose of orforglipron led to statistically significant improvements across the primary and all key secondary endpoints.

  • Percent weight reduction: -7.5% (-7.8 kg; 17.2 lbs; 6 mg), -8.4% (-8.6 kg; 19.0 lbs; 12 mg), -11.2% (-11.3 kg; 25.0 lbs; 36 mg), -2.1% (-2.4 kg; 5.3 lbs; placebo)
  • Percentage of participants achieving body weight reductions of �10%: 33.3% (6 mg), 40.0% (12 mg), 54.6% (36 mg), 12.9% (placebo)
  • Percentage of participants achieving body weight reductions of �15%: 15.1% (6 mg), 20.3% (12 mg), 36.0% (36 mg), 5.9% (placebo)

The overall safety profile of orforglipron in ATTAIN-1 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 (28.9%, 35.9% and 33.7%) vs. 10.4% with placebo, constipation (21.7%, 29.8% and 25.4%) vs. 9.3% with placebo, diarrhea (21.0%, 22.8% and 23.1%) vs. 9.6% with placebo, vomiting (13.0%, 21.4% and 24.0%) vs. 3.5% with placebo, and dyspepsia (13.0%, 16.2% and 14.1%) vs. 5.0% with placebo. Treatment discontinuation rates due to adverse events were 5.1% (6 mg), 7.7% (12 mg) and 10.3% (36 mg) for orforglipron vs. 2.6% with placebo. The overall treatment discontinuation rates were 21.9% (6 mg), 22.5% (12 mg) and 24.4% (36 mg) fororforglipronvs. 29.9% with placebo. No hepatic safety signal was observed.

The detailed ATTAIN-1 results will be presented next month at theEuropean Association for the Study of Diabetes(EASD) Annual Meeting 2025 and published in a peer-reviewed journal. More results from the ATTAIN Phase 3 clinical trial program will be shared later this year, along with findings from the ACHIEVE Phase 3 clinical trial program evaluating orforglipron for adults with type 2 diabetes.

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 (OSA) and hypertension in adults with obesity.

About ATTAIN-1 and ATTAIN clinical trial program
ATTAIN-1 (NCT05869903) 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 to placebo in adults with obesity, or overweight with at least one of the following comorbidities: hypertension, dyslipidemia, OSAor cardiovascular disease, who did not have diabetes.The trial randomized 3,127 participants across the U.S., Brazil, China, India, Japan, South Korea, Puerto Rico, Slovakia, Spain and Taiwan in 3:3:3:4 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 body weightreduction from baseline after 72 weeks in people witha BMI �30.0 kg/m² or a BMI �27.0 kg/m² with at least one weight-related comorbidity and a history of at least one self-reported unsuccessful dietary effort to lose body weight. All participants in the orforglipron treatment arms started the study at a dose of orforglipron 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. The program began in 2023 with additional results anticipated this year.

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 and, or follow us on, and . P-LLY

Endnotes and References:

  1. The efficacyestimand represents efficacy had all randomized participants remained on study intervention (with possible dose interruptions and modifications) for 72 weeks without initiating prohibited weight management treatments.
  2. The treatment-regimenestimand represents the estimated average treatment effect regardless of adherence to study intervention or initiation of prohibited weight management treatments.
  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).

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.

Trademarks and Trade Names
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.

Refer to:

Brooke Frost; [email protected]; 317-432-9145 (Media)


Michael Czapar; [email protected]; 317-617-0983 (Investors)

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FAQ

What were the weight loss results from Lilly's (LLY) Phase 3 ATTAIN-1 trial for orforglipron?

Participants taking the highest dose (36mg) lost an average of 27.3 lbs (12.4%) compared to 2.2 lbs (0.9%) with placebo over 72 weeks.

What are the main side effects of Lilly's oral GLP-1 drug orforglipron?

The most common side effects were gastrointestinal-related, including nausea (33.7%), constipation (25.4%), diarrhea (23.1%), and vomiting (24.0%) at the highest dose.

How many patients achieved significant weight loss with Lilly's orforglipron in the ATTAIN-1 trial?

At the highest dose, 59.6% of participants lost �10% of their body weight, while 39.6% lost �15% of their body weight.

When will Lilly submit orforglipron for FDA approval?

Lilly plans to submit orforglipron for regulatory review by year-end 2025.

What cardiovascular benefits were observed with Lilly's orforglipron?

The drug showed reductions in non-HDL cholesterol, triglycerides, systolic blood pressure, and achieved a 47.7% reduction in hsCRP levels at the highest dose.
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