Millions of Americans taking blockbuster GLP-1 drugs like Ozempic, Wegovy, and Mounjaro are entering summer with a hidden hazard: these medications blunt thirst signals, raising the risk of severe dehydration and kidney injury during heat waves, the FDA warns. The agency cautions that reduced fluid intake — combined with the drugs' tendency to lower blood pressure — can send patients to the ER faster than a sunburn, while heat can also damage the medications...