Headache? Sore back? Bad cold? In the past, many Americans would reach into their medicine cabinets and pull out acetaminophen, known by the brand-name Tylenol, without any concern at all. It's long been a staple of home medicine, seen as a safe way to treat pain and fever in pregnancy as well as in childhood, when used as directed. But President Trump has come out swinging against this common over-the-counter drug, blaming it for rising cases of autism in recent years.

"Don't take Tylenol if you're pregnant, and don't give Tylenol to your child," Trump said in a White House briefing, emphatically repeating this warning more than a dozen times. "Fight like hell not to take it."

Physician groups, plus the maker of Tylenol, immediately pushed back on the president's stance, saying it just

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