Tylenol During Pregnancy Linked to AutismAnother in a long list of reasons to avoid this drug. A recent study found that boys exposed to acetaminophen (Tylenol) before birth were more likely to have symptoms of autism during childhood. This isn’t the first time that scientists have reported a connection between using this drug during pregnancy and brain and behavior abnormalities in children. Other studies show that exposure to acetaminophen raised the risk of developing ADHD (attention deficit hyperactivity disorder) by 40%. Another study found that women taking it increased the risk of their child having behavioral problems by 70%. Pregnant mothers aren’t the only ones who should avoid acetaminophen and other common painkillers like NSAIDS (non-steroidal anti-inflammatory drugs)—a class that includes drugs like Advil, Celebrex, and Aleve.