While the underlying cause or causes of autism spectrum disorder remain elusive and appear likely to be a complex interplay of genetic and environmental factors, President Trump and his anti-vaccine health secretary Robert F. Kennedy Jr.—neither of whom have any scientific or medical background whatsoever—have decided to pin the blame on Tylenol, a common pain reliever and fever reducer that has no proven link to autism.
And now, Texas Attorney General Ken Paxton is suing the maker of Tylenol, Kenvue and Johnson & Johnson, who previously sold Tylenol, claiming that they have been “deceptively marketing Tylenol” knowing that it “leads to a significantly increased risk of autism and other disorders.”
To back that claim, Paxton relies on the “considerable body of evidence… recently highlighted by the Trump Administration.”
Of course, there is no “considerable” evidence for this claim, only tenuous associations and conflicting studies. Trump and Kennedy’s justification for blaming Tylenol was revealed in a rambling, incoherent press conference last month, in which Trump spoke of a “rumor” about Tylenol and his “opinion” on the matter. Still, he firmly warned against its use, saying well over a dozen times: “don’t take Tylenol.”
“Don’t take Tylenol. There’s no downside. Don’t take it. You’ll be uncomfortable. It won’t be as easy maybe, but don’t take it if you’re pregnant. Don’t take Tylenol and don’t give it to the baby after the baby is born,” he said.
“Scientifically unfounded”
As Ars has reported previously, there are some studies that have found an association between use of Tylenol (aka acetaminophen or paracetamol) and a higher risk of autism. But, many of the studies finding such an association have significant flaws. Other studies have found no link. That includes a highly regarded Swedish study that compared autism risk among siblings with different acetaminophen exposures during pregnancy, but otherwise similar genetic and environmental risks. Acetaminophen didn’t make a difference, suggesting other genetic and/or environmental factors might explain any associations. Further, even if there is a real association (aka a correlation) between acetaminophen use and autism risk, that does not mean the pain reliever is the cause of autism.