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FDA approves new version of diabetes drug Mounjaro for weight loss

A new version of the popular diabetes treatment Mounjaro can be sold as a weight-loss drug, U.S. regulators announced Wednesday.

The U.S. Food and Drug Administration approved Eli Lilly’s Zepbound, or tirzepatide. The drug helped dieters lose about a quarter of their body weight, or 60 pounds (27 kilograms), in a recent study.

Zepbound is the latest diabetes drug approved for weight loss, joining Novo Nordisk’s Wegovy, a high-dose version of its diabetes treatment Ozempic.

T he FDA approved Lilly’s drug for people who are considered obese, with a body mass index of 30 or higher, or those who are overweight with a related health condition, like high blood pressure, high cholesterol or diabetes. The drug should be paired with a healthy diet and regular exercise, the FDA said.

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In the U.S., at least 100 million adults and about 15 million children are considered obese.

The drug tirzepatide in Zepbound and Mounjaro and semaglutide in Wegovy and Ozempic work by mimicking hormones that kick in after people eat to regulate appetite and the feeling of fullness. Both imitate a hormone called glucagon-like peptide-1, known as GLP-1. Tirzepatide targets a second hormone, called glucose-dependent insulinotropic polypeptide, or GIP.

Zepbound appears to spur greater weight loss than Wegovy. Approved for chronic weight management in 2021, Wegovy helped people lose about 15% of their body weight or 34 pounds (15.4 kilograms), according to study results.

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“This would be the most highly efficacious drug ever approved for the treatment of obesity,” said Dr. Fatima Cody Stanford, an obesity medicine expert at Massachusetts General Hospital in Boston.

Touted by celebrities and on social media, semaglutide and tirzepatide drugs have already been in such demand that their manufacturers have struggled to keep up. Both have been listed on the FDA’s drug shortage site for months. All strengths of tirzepatide are currently listed as available, but a company spokesperson said that could vary by location and demand.

Side effects of the new weight-loss drug include vomiting, nausea, diarrhea, constipation and other gastrointestinal problems. In the most recent published trial, about 10% of people taking tirzepatide dropped out of the study because of such problems, compared to about 2% of people taking dummy shots.

While experts lauded approval of Zepbound, they worried that it wouldn’t necessarily mean greater access to the drug, which has been prescribed “off-label” to help people pare pounds.

“Most patients won’t be able to afford Zepbound without insurance coverage and many health plans exclude obesity care,” said Dr. Katherine Saunders, an obesity expert at New York’s Weill Cornell Medicine and co-founder of company focused on obesity treatment.

Eli Lilly and Co. said the list price for will be about $1,000 a month, the same as Mounjaro. Medicare is prohibited from covering drugs specifically for weight loss.

Kelly Burns, 50, of St. Petersburg, Florida, lost nearly 100 pounds (45 kilograms) using tirzepatide after joining a study of the drug to treat obesity in 2021. When testing ended and she no longer had access to the medication, she struggled, but eventually lost another 50 pounds (23 kilograms).

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“My whole life is completely different,” she said. Her health measurements improved and her confidence soared. Now that is approved for weight loss, Burns plans to ask her insurance company about coverage. “It would be ridiculous not to,” she said, adding: “I want to stay this way as long as I possibly can.”

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.