Women who take angiotensin-converting enzyme (ACE) inhibitors to treat high blood pressure in the first trimester of their pregnancies are at no greater risk of having babies with birth defects than are women who take other types of high blood pressure medication or who take no blood pressure drugs, according to a new study from the U.S. Department of Health and Human Services’ (HHS) Agency for Healthcare Research and Quality (AHRQ). The study suggests that the underlying high blood pressure itself may increase the risk of birth defects, rather than blood pressure medications taken during the first trimester of pregnancy.