Research has looked at whether acetaminophen (Tylenol/paracetamol) use might be linked to autism, but the results are uncertain and debated. Some studies suggest that frequent use, especially during pregnancy or early childhood, could be associated with a higher risk of autism or related developmental issues. Other studies, however, do not find this link, and no proof of causation exists.

Major medical organizations, including the American Academy of Pediatrics, still consider acetaminophen safe when used correctly for pain or fever. Experts agree that more high-quality research is needed, and families should not avoid acetaminophen when it is medically necessary.