A new study has debunked claims of any link between the use of Tylenol in pregnancy and diagnoses of autism, ADHD, or intellectual disabilities in children. According to the research published in The Lancet, there is no evidence to support any causal link between prenatal Tylenol exposure and any kind of neurological conditions. The findings support existing recommendations from medical groups like the American College of Obstetricians and Gynecologists on the safety of using acetaminophen - the active ingredient in Tylenol- as the first-line medication for relieving pain or fever during pregnancy, the authors say.