BU Autism Expert Says Research Hasn't Confirmed Tylenol Link The Brink Boston University The headline Tylenol causes autism has sparked concern. But the science tells a more nuanced story. Some observational studies have found that when pregnant women used more acetaminophen, their Mark Hyman, Tylenol (acetaminophen) does not cause autism. The FDA, in its statement that there may be an association, confirmed that "a causal relationship has not been established, and studies of millions of children No Clear Autism Link With Prenatal Tylenol, Major Review Finds MedPage Today