One participant lost 22% of her weight in nine months — substantially faster than the rate seen with approved GLP-1 drugs like Wegovy or Zepbound. Her weight dropped so much that researchers reduced her dose of the treatment, called retatrutide. Still, she continued to feel too nauseous, so she decided by herself to start skipping every other dose.

Several individuals enrolled in a phase 3 trial for Eli Lilly's (NYSE:LLY) next-generation obesity drug, retatrutide, say that while they have seen incredible weight loss, it has also come with its share of notable side effects.

A telehealth company partnered with a pharmacy that lacked a required license, raising doubts about the safety and efficacy of the weight-loss medicines it mailed to patients.

Popular weight-loss therapies like Novo Nordisk's Wegovy and Eli Lilly's Zepbound result in both fat and muscle loss.

The weight-loss drug boom has transformed Eli Lilly (LLY), the maker of Zepbound, into the largest healthcare company in the world. Now, the pharma giant wants to reinvest its success with weight-loss meds into tackling some of the world’s toughest health challenges.