Study
Survodutide Once Weekly for the Treatment of Adults with Obesity (SYNCHRONIZE-1)
Phase 3 (N=725) survodutide 3.6/6.0 mg weekly cut body weight ~12-13% vs 5.4% placebo at 76 weeks; ~72% achieved >=5% loss; GI AEs 81-90% but no deaths.
Summary Can a weekly medicine help adults with obesity lose meaningful weight? Show / hide ↓
Researchers randomly assigned 725 adults with obesity and no diabetes to weekly survodutide injections at 3.6 milligrams, 6.0 milligrams, or a placebo, an injection with no active medicine, for 76 weeks. Neither the participants nor the researchers knew who received which treatment until the study ended, reducing bias. Survodutide acts like two natural body signals involved in appetite and blood-sugar control. Average weight loss was 12.2% with the lower dose and 13.0% with the higher dose, compared with 5.4% with placebo. About 72% of people taking survodutide lost at least 5% of their weight, but stomach and bowel side effects occurred in 81% to 90% of them, compared with 48% taking placebo; no deaths were reported.
What this means for you: This is strong evidence that survodutide can produce meaningful weight loss in adults with obesity, but stomach and bowel side effects were common. The results do not show how well it works long term or whether they apply to people with diabetes or other health conditions, so it should not be started without medical advice.
solid evidenceThe SYNCHRONIZE-1 trial randomized 725 adults with obesity without diabetes 1:1:1 to weekly subcutaneous survodutide 3.6 mg, 6.0 mg, or placebo for 76 weeks. Survodutide is a dual GLP-1/glucagon receptor agonist from Boehringer Ingelheim, licensed from Zealand Pharma. Mean body-weight change (treatment-regimen estimand) was -12.2% (95% CI -13.6 to -10.8) at 3.6 mg, -13.0% (95% CI -14.4 to -11.6) at 6.0 mg, and -5.4% (95% CI -6.9 to -4.0) with placebo. 72.6% and 71.9% of the two survodutide groups achieved at least 5% weight reduction versus 46.3% with placebo (P<0.001 for both survodutide comparisons). Gastrointestinal adverse events occurred in 80.9% (3.6 mg), 89.7% (6.0 mg), and 47.9% (placebo), typically mild to moderate. No deaths were reported. This is the pivotal Phase 3 efficacy trial supporting Boehringer's regulatory submissions.
Survodutide led to significantly greater reductions in body weight than placebo in adults with obesity without diabetes.
Efficacy is competitive with tirzepatide and semaglutide but not clearly superior on head-to-head weight-loss magnitude. Nearly 90% GI AE rate at the 6.0 mg dose is a real tolerability concern, and press coverage of prior readouts noted ~19% discontinuation from side effects, roughly three times the tirzepatide rate. No cardiovascular outcomes data yet; SYNCHRONIZE-CVOT is ongoing.
Cited by
4 encyclopedia entries reference this study.