New research finds no clear link between acetaminophen (Tylenol) and autism

A sweeping review of existing studies finds no solid evidence that using acetaminophen (Tylenol) during pregnancy increases the risk of autism or ADHD in children. Researchers found that previous reviews often relied on weak or biased data, and most did not properly account for genetic or environmental factors shared by families. When these factors were considered, any apparent link between acetaminophen use and neurodevelopmental disorders largely disappeared.