Neither the painkiller Tylenol nor vaccines have been shown to cause autism, the World Health Organization said on Tuesday, following comments from the US president and his administration to the contrary.
President Donald Trump insisted on Monday that pregnant women should "tough it out" and avoid Tylenol due to an unproven link to autism and also urged major changes to the standard vaccines administered to babies.
Medical groups have long cited acetaminophen, or paracetamol — the primary ingredient in Tylenol -- as among the safest painkillers to take during pregnancy.
WHO spokesman Tarik Jasarevic acknowledged that some observational studies — which are based purely on observations and do not include control or treatment groups — had "suggested a possible association between prenatal exposure to acetaminophen or paracetamol and autism".
But, he told reporters in Geneva, "the evidence remains inconsistent" with other studies finding "no such relationship".
"If the link between acetaminophen and autism were strong, it would likely have been consistently observed across multiple studies," he said, warning against "drawing casual conclusions about the role of acetaminophen in autism".
European medical regulators meanwhile said their recommendations that pregnant women can use paracetamol for pain relief had not changed.
"Patient safety is our top priority. There is no evidence that taking paracetamol during pregnancy causes autism in children," Alison Cave, safety chief at Britain's Medicines and Healthcare products Regulatory Agency (MHRA), said in a statement.
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