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On 22 September, US President Donald Trump reignited long-standing and damaging debates linking autism to medical interventions, this time targeting a household medication, paracetamol.1 Speaking at a press conference, he advised pregnant women to avoid paracetamol (known in the USA as acetaminophen or Tylenol), claiming it poses a ‘very increased risk of autism.’ He went further, urging parents not to administer it to infants and suggesting that the US Food and Drug Administration (FDA) discourages its use in pregnancy unless ‘medically necessary’.2 In the same address, his administration promoted folinic acid (leucovorin) as a possible treatment for autism and repeated long-discredited claims linking vaccines to autism.2