An appeals court has revived lawsuits claiming a link between acetaminophen, a common ingredient in Tylenol, and the development of autism and ADHD. The lawsuits, which had been previously dismissed, will now move forward against Kenvue, the maker of Tylenol. The revival of these lawsuits suggests that the issue of a potential connection between Tylenol and autism and ADHD will continue to be explored in the courts.