Evaluating the Role of Susceptibility Inducing Cofactors and of Acetaminophen in the Etiology of Autism Spectrum Disorder Acetaminophen Use During Pregnancy and Autism Risk Acetaminophen is an over the counter medicine used to reduce fevers and relieve pain. It is sold under many brand names, including Tylenol. Decades of research have found that acetaminophen is safe for children Acetaminophen Toxicity: How Genetic Susceptibility Combines with Environmental Factors