A woman who has type 2 diabetes mellitus is now pregnant. She wants to know whether to take her oral antidiabetic medication. What instructions will she receive?

Choice A rationale Continuing the oral antidiabetic medication at the same dosage is incorrect. Most oral antidiabetic medications are classified as teratogenic or potentially teratogenic, meaning they can cause harm to the developing fetus. Their use is not recommended during pregnancy due to the risk of congenital anomalies and other complications. Therefore, the medication should be discontinued immediately. Choice B rationale Increasing the dosage of oral antidiabetic medication is incorrect. As discussed, oral antidiabetic agents are generally contraindicated in pregnancy due to their potential teratogenic effects on the fetus. Increasing the dose would exacerbate this risk. The standard of care for managing diabetes during pregnancy involves discontinuing these medications and initiating a safer alternative. Choice C rationale The correct instruction is that she will be switched to insulin therapy while pregnant. Insulin is the preferred treatment for managing diabetes during pregnancy because it does not cross the placental barrier and thus does not pose a risk to the fetus. It is a safe and effective way to achieve tight glycemic control, which is essential for a healthy pregnancy outcome and to prevent complications for both mother and baby. Choice D rationale Not receiving any medication while pregnant is incorrect. Poorly controlled diabetes during pregnancy significantly increases the risk of complications such as preeclampsia, macrosomia, and birth defects. Therefore, relying on diet and exercise alone is generally not sufficient to maintain stable blood glucose levels. Medical intervention, specifically insulin therapy, is necessary to ensure optimal maternal and fetal health.