Orforglipron for maintenance of body weight reduction: the double-blind, randomized phase 3b ATTAIN-MAINTAIN trial

Incretins have improved the management of obesity and its related complications, but maintaining these health benefits requires ongoing administration, which can be challenging. Orforglipron, a once-daily oral nonpeptide glucagon-like peptide-1 (GLP-1) receptor agonist, has demonstrated weight loss efficacy, improvements in cardiometabolic risk factors, and safety generally similar to injectable GLP-1 receptor agonists. Here this double-blind, placebo-controlled trial randomized participants previously treated with tirzepatide (cohort 1: N = 205) or semaglutide (cohort 2: N = 171) during the SURMOUNT-5 study to orforglipron once daily or placebo. Cohort 1 participants who achieved body weight plateau maintained a model-based estimate (MBE) of 74.7% (s.e.m. 4.05) of body weight reduction with orforglipron compared with an MBE of 49.2% (s.e.m. 3.92) with placebo, resulting in an estimated treatment difference of MBE 25.5% (95% confidence interval 14.5 to 36.5); P < 0.001; treatment-regimen estimand) at week 52. Cohort 2 participants who achieved body weight plateau maintained an MBE of 79.3% (s.e.m. 4.42) of body weight reduction with orforglipron compared with an MBE of 37.6% (s.e.m. 7.46) with placebo, resulting in an estimated treatment difference of MBE 41.7 (95% confidence interval 24.4 to 59.0); P < 0.001; treatment-regimen estimand) at week 52. All key secondary endpoints were met. The most common adverse events were gastrointestinal effects, which were mostly mild to moderate in severity. These data demonstrate orforglipron's potential as a globally scalable option for minimizing weight changes after injectable therapy. Trial limitations include the absence of a comparator arm involving continued use of injectable obesity-management medications and the trial's 1-year duration. ClinicalTrials.gov registration: NCT06584916 .