1) Exposure to certain medications like anticonvulsants, lithium, angiotensin-converting enzyme inhibitors, and NSAIDs during pregnancy increases the risk of congenital heart disease in fetuses. 2) Anticonvulsants like carbamazepine have been associated with a 1.8% risk of cardiac malformations in exposed fetuses. Lithium exposure has been linked to a risk of up to 8% for cardiac anomalies, though more recent studies find a lower risk of 1.1%. 3) Angiotensin-converting enzyme inhibitor exposure in the first trimester is associated with increased risk of congenital heart disease.