Is Tylenol Safe During Pregnancy? Risk Factors, Not Causation 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 Is Tylenol Safe During Pregnancy? Understanding Risk Factors Seeking Health