Drug used in diabetes treatment Mounjaro helped dieters shed 60 pounds, study finds

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The medicine in the diabetes drug Mounjaro helped people with obesity or who are overweight lose at least a quarter of their body weight, or about 60 pounds on average, when combined with intensive diet and exercise, a new study shows. By comparison, a group of people who also dieted and exercised, but then received dummy shots, lost weight initially but then regained some, researchers reported in the journal Nature Medicine. “This study says that if you lose weight before you start the drug, you can then add a lot more weight loss after,” said Dr. Thomas Wadden, a University of Pennsylvania obesity researcher and psychology professor who led the study. The results, which were also presented at a medical conference, confirm that the drug made by Eli Lilly & Co. has the potential to be one of the most powerful medical treatments for obesity to date, outside experts said. The injected drug, tirzepatide, was approved in the U.S. in May 2022 to treat diabetes. Sold as Mounjaro, it has been used “off-label” to treat obesity, joining a frenzy of demand for diabetes and weight-loss medications including Ozempic and Wegovy, made by Novo Nordisk. The new study, which was funded by Eli Lilly, enrolled about 800 people who had obesity or were overweight with a weight-related health complication — but not diabetes. On average, study participants weighed about 241 pounds (109.5 kilograms) to start and had a body-mass index — a common measure of obesity — of about 38. After three months of intensive diet and exercise, more than 200 participants left the trial, either because they failed to lose enough weight or for other reasons. The remaining nearly 600 people were randomized to receive tirzepatide or a placebo via weekly injections for about 16 months. Nearly 500 people completed the study. Side effects including nausea, diarrhea and constipation were reported more frequently in people taking the drug than those taking the placebo. More than 10% of those taking the drug discontinued the study because of side effects, compared with about 2% of those on placebo. This article was provided by The Associated Press.