President Donald Trump created a potentially existential crisis for Tylenol maker Kenvue with just three words about the company’s most-recognised product: “Don’t take it”.

Trump’s warnings about the unproven link between Tylenol use during pregnancy to autism in children risks reinvigorating a barrage of litigation over the issue that the company has sought to put behind it.

A federal court in December dismissed lawsuits alleging a link between the active ingredient in the over-the-counter pain treatment and the developmental disorder.

The US Food and Drug Administration has initiated the process for a label change to products containing acetaminophen that will say the ingredient is associated with a higher risk of autism in children when taken by pregnant women. It has also issued a r

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