Hormonal
Weekly subcutaneous semaglutide (2.4 mg) and tirzepatide (up to 15 mg) produce significantly greater mean weight loss (12-21%) in non-diabetic obese adults compared to daily liraglutide (3 mg, 5-8%) or placebo.
If you have obesity and are not diabetic, newer weekly injections like semaglutide (2.4 mg) or tirzepatide (up to 15 mg) are significantly more effective for weight loss than older daily options like liraglutide. Expect 15-20% body weight loss in clinical trials. Be prepared for gastrointestinal side effects, which usually improve over time. Crucially, stopping the medication typically leads to significant weight regain, suggesting long-term use may be necessary for sustained results.
In the 68-week STEP 8 trial, a statistically significant reduction in body weight was observed, with a mean percentage change of –15.8% for once-weekly semaglutide 2.4 mg and –6.4% for once-daily liraglutide 3 mg. In the 72-week SURMOUNT 1 trial, tirzepatide resulted in mean weight change of −15.0%, −19.5%, and −20.9% with weekly doses of 5 mg, 10 mg, and 15 mg, respectively, compared to −3.1% with placebo.
Why this rating
Based on multiple large-scale, randomized clinical trials (STEP 1, 3, 4, 8; SURMOUNT 1, 3) with statistically significant results.
Source
Incretin Analogues for Weight Reduction in Non-Diabetic Obese: A Review of Liraglutide, Semaglutide, and Tirzepatide Beyond Glycemic Control
Krishna Nikhila Bonga et al. · Rambam Maimonides Medical Journal · 2026
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