Experts warn Neurocrine's Vykat XR linked to Prader-Willi deaths and harms
Physicians and experts treating Prader-Willi syndrome notified clinicians that a series of deaths and severe side effects may be associated with Vykat XR, newly approved by the FDA in March 2025. FDA adverse-event monitoring lists seven deaths among patients prescribed the drug and more than 100 reports of serious events, often hospitalizations for swelling, respiratory, and heart complications.