Pain reliever Tylenol is a classic American brand, with tens of millions of users and a 70-year history. The company behind it, Kenvue, is just 2 years old and unknown to most Americans.

But on Monday, President Trump ignited a growing public relations nightmare for the company. In extraordinary remarks giving direct medical advice, he claimed there was a link between Tylenol use during pregnancy and autism, a connection that remains unproven.

"If you're pregnant, don't take Tylenol," Trump said repeatedly at a White House news conference.

Trump officials said they would seek to update the drug's label and warn doctors against using the drug in pregnant women for routine fevers.

Tylenol has weathered crises before. In the 1980s, Tylenol became the textbook example of how to manage a co

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