If you’re a pregnant woman and have a backache or headache, or a fever, your options for over-the-counter treatment basically boil down to one medication: the pain reliever acetaminophen, better known as Tylenol. Doctors advise against using nonsteroidal anti-inflammatories, like ibuprofen and aspirin, during late pregnancy because they can compromise fetal circulation and have other adverse consequences.
But evidence has accumulated that, when taken during pregnancy, acetaminophen may increase the risk that children will develop asthma or attention deficit hyperactivity disorder. The elevated risk in most studies is small, and whether the drug itself is really to blame is debatable. But considering that more than 65 percent of pregnant women in the United States use acetaminophen at some point during their pregnancy, the number of children with problems stemming from it could be substantial.
Read the story at the NY Times