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A late-stage trial of retatrutide showed large weight loss in type 2 diabetes

In an 80-week trial of 1,152 adults with obesity and type 2 diabetes, the highest dose of the experimental drug retatrutide cut weight more than placebo and lowered HbA1c. It is not FDA-approved.

Verified · Source: Medical XpressOct 13, 2026 · 1 min read
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An illustration of a handheld blood glucose meter
Illustrative drawing of a blood glucose meter. This is not retatrutide, not a patient, and not a photo of an approved product. BruceBlaus / Wikimedia Commons · CC BY 3.0

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Medical Xpress reported results from The Lancet on TRIUMPH-2, an 80-week Phase 3 trial of 1,152 adults who had obesity and type 2 diabetes. At the highest dose, Eli Lilly's experimental weekly injection, retatrutide, was associated with an average weight loss of 18.8 percent, compared with 5.1 percent for people who received a placebo. Hemoglobin A1c, a longer-term measure of blood sugar, was about 1.5 points lower.

The drug is still experimental. It is not approved by the Food and Drug Administration, and this trial is not a decision that it will be. Gastrointestinal side effects were common. The study does not show that retatrutide cures diabetes, and it does not replace care a person already has. A clinician is the right person to talk with about treatments that are already approved.

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