A common pain reliever used by millions is now the target of a warning by the Trump administration.

The president said the use of acetaminophen, the active ingredient in Tylenol, during pregnancy could cause autism in children, but medical experts say studies so far haven’t shown that link.

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“There's not evidence to conclude that acetaminophen causes autism,” Dr. James McPartland, a professor at the Yale School of Medicine, said.

He has been studying autism for more than 20 years and is reacting to news of the Trump administration warning doctors to not issue acetaminophen, the active ingredient in Tylenol, during pregnancy, claiming it causes autism.

“So taking Tylenol is not good, or I'll say it, it's not good,

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