The U.S. Food and Drug Administration plans to approve a new use for the generic drug leucovorin as a treatment for kids with autism. The FDA is filing a Federal Register notice to change the label on an exciting treatment called prescription leucovorin so that it can be available to children with autism," FDA Commissioner Marty Makary said, adding, "We have thousands of kids, in my opinion, who will benefit." Dig deeper:According to Mayo Clinic, Leucovorin is a prescription drug that is used to counteract the harmful effects of methotrexate (a common chemotherapy medication). While scientists say leucovorin could be promising for a subset of autism patients, they cautioned that the current data is limited, and the drug needs more research. Tylenol is a brand name for the over-the-counter (OTC) medication acetaminophen, which is used to relieve pain and reduce fever.