Oral GLP-1 Pill Orforglipron Cuts Blood Sugar and Weight More Than Injectable Dulaglutide in Phase 2 Trial
The oral non-peptide GLP-1 receptor agonist orforglipron reduced HbA1c by up to 2.1% and body weight by up to 10.1 kg over 26 weeks in people with type 2 diabetes, outperforming both placebo and injectable dulaglutide.
Quick Facts
What This Study Found
At week 26, orforglipron at doses of 12 mg or greater produced statistically superior HbA1c reductions compared to placebo. The maximum HbA1c reduction was -2.10% (placebo-adjusted: -1.67%), compared to -0.43% with placebo and -1.10% with injectable dulaglutide 1.5 mg weekly.
Weight loss with orforglipron reached up to -10.1 kg (placebo-adjusted: -7.9 kg), compared to -2.2 kg with placebo and -3.9 kg with dulaglutide.
Gastrointestinal adverse events occurred in 44-70% of orforglipron-treated patients (vs. 18% placebo, 34% dulaglutide) but were mostly mild to moderate. Clinically significant hypoglycemia was rare (3 orforglipron patients, 1 dulaglutide). No severe hypoglycemia occurred. The study completion rate was 92%, with 79% completing the full 26 weeks of treatment.
Key Numbers
How They Did This
This was a 26-week, phase 2, double-blind, randomized, multicentre study across 45 centres in the USA, Hungary, Poland, and Slovakia. 383 adults with type 2 diabetes (HbA1c 7.0-10.5%, BMI ≥23) on diet/exercise with or without metformin were randomized to placebo, dulaglutide 1.5 mg weekly, or one of six orforglipron dose groups (3, 12, 24, 36, or 45 mg daily, with two different escalation regimens for the 36 and 45 mg doses). Participants were masked to treatment. The primary endpoint was mean HbA1c change from baseline at week 26.
Why This Research Matters
This study represents a potential paradigm shift in GLP-1 therapy. Current oral GLP-1 options (like oral semaglutide) are still peptide-based and require strict fasting before dosing. Orforglipron is a non-peptide molecule that can be taken without food or water restrictions, while delivering blood sugar and weight loss results that exceeded an injectable GLP-1 drug. If confirmed in phase 3 trials, this could make GLP-1 therapy far more accessible and convenient for millions of diabetes patients.
The Bigger Picture
The GLP-1 receptor agonist market has exploded, with drugs like semaglutide (Ozempic/Wegovy) transforming diabetes and obesity treatment. However, most GLP-1 drugs require injections, and even oral semaglutide needs strict fasting. A non-peptide oral GLP-1 agonist that can be taken with food and water would remove major barriers to treatment adherence. Orforglipron, developed by Eli Lilly, is one of the most advanced oral non-peptide GLP-1 candidates and these phase 2 results from The Lancet helped propel it into large-scale phase 3 testing.
What This Study Doesn't Tell Us
This is a phase 2 dose-finding study with a relatively small sample size (383 participants) and short duration (26 weeks). Long-term safety and efficacy data are needed. The gastrointestinal adverse event rate was high (up to 70%), which could affect real-world adherence. Only 79% completed the full treatment course. The study population was primarily from the US and Eastern Europe, limiting global generalizability. The study was sponsored by Eli Lilly, the drug's manufacturer.
Questions This Raises
- ?Will the high gastrointestinal side effect rates seen at higher doses be manageable in long-term use, or will they limit practical dosing?
- ?How will orforglipron compare to oral semaglutide in head-to-head trials?
- ?Can orforglipron achieve comparable cardiovascular outcome benefits to injectable GLP-1 receptor agonists that have been proven to reduce heart attacks and strokes?
Trust & Context
- Key Stat:
- Up to -2.10% HbA1c reduction Orforglipron achieved HbA1c reductions nearly double those of the injectable GLP-1 drug dulaglutide (-1.10%) and far exceeding placebo (-0.43%) over 26 weeks.
- Evidence Grade:
- This is a well-designed phase 2 randomized controlled trial published in The Lancet with an active comparator (dulaglutide), placebo control, and double-blinding. The evidence is strong for the dose range studied but is still preliminary — phase 3 confirmation with larger populations and longer follow-up is required for regulatory approval.
- Study Age:
- Published in 2023, this landmark study helped advance orforglipron into phase 3 clinical trials. By 2026, additional data from larger trials may be available, potentially including regulatory decisions.
- Original Title:
- Efficacy and safety of oral orforglipron in patients with type 2 diabetes: a multicentre, randomised, dose-response, phase 2 study.
- Published In:
- Lancet (London, England), 402(10400), 472-483 (2023)
- Authors:
- Frias, Juan P(5), Hsia, Stanley, Eyde, Sarah, Liu, Rong, Ma, Xiaosu, Konig, Manige, Kazda, Christof, Mather, Kieren J, Haupt, Axel, Pratt, Edward, Robins, Deborah
- Database ID:
- RPEP-06884
Evidence Hierarchy
Frequently Asked Questions
How is orforglipron different from oral semaglutide (Rybelsus)?
Oral semaglutide is still a peptide — it requires special absorption-enhancing technology and must be taken on an empty stomach with only a small sip of water, with no eating for 30 minutes. Orforglipron is a non-peptide small molecule that activates the same GLP-1 receptor but can be taken with food and water without restrictions, making it potentially much more convenient for daily use.
Why were the side effects so common with orforglipron?
The gastrointestinal side effects (nausea, vomiting, diarrhea) are characteristic of all GLP-1 receptor agonists because GLP-1 naturally slows stomach emptying and affects appetite. These effects were mostly mild to moderate and are typically worst during dose escalation. The rates were higher than dulaglutide partly because the study tested multiple dose levels, including very high doses. The two different escalation regimens for higher doses suggest the researchers were already trying to find the best way to minimize these effects.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-06884APA
Frias, Juan P; Hsia, Stanley; Eyde, Sarah; Liu, Rong; Ma, Xiaosu; Konig, Manige; Kazda, Christof; Mather, Kieren J; Haupt, Axel; Pratt, Edward; Robins, Deborah. (2023). Efficacy and safety of oral orforglipron in patients with type 2 diabetes: a multicentre, randomised, dose-response, phase 2 study.. Lancet (London, England), 402(10400), 472-483. https://doi.org/10.1016/S0140-6736(23)01302-8
MLA
Frias, Juan P, et al. "Efficacy and safety of oral orforglipron in patients with type 2 diabetes: a multicentre, randomised, dose-response, phase 2 study.." Lancet (London, 2023. https://doi.org/10.1016/S0140-6736(23)01302-8
RethinkPeptides
RethinkPeptides Research Database. "Efficacy and safety of oral orforglipron in patients with ty..." RPEP-06884. Retrieved from https://rethinkpeptides.com/research/frias-2023-efficacy-and-safety-of
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Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.