The Brief President Trump announced that the FDA will instruct doctors to warn pregnant women about a potential link between the active ingredient in Tylenol and autism. The manufacturer of Tylenol has stated that its own independent research shows no causal link between the drug and autism. Big picture view:The Food and Drug Administration (FDA) will begin notifying doctors to warn pregnant patients about the potential risk. "Which is basically known as Tylenol during pregnancy, can be associated with a very increased risk of autism," said Trump. I'll say it is not good," said President Trump.