Name a common medication used for managing gestational diabetes.

Insulin is a common medication used for managing gestational diabetes because it is the most effective way to maintain glucose control during pregnancy. Women with gestational diabetes often have insulin resistance, and the body may not produce enough insulin to manage blood sugar levels effectively. Insulin therapy can help regulate blood glucose levels without crossing the placenta, ensuring safety for both the mother and the developing fetus.

Metformin is sometimes used off-label for treating gestational diabetes, particularly in women who have insulin resistance, but it is not the first-line treatment as insulin is. Sitagliptin and glipizide, while used for managing type 2 diabetes, are not commonly recommended during pregnancy due to insufficient research on their safety and efficacy in that population. In contrast, insulin's well-established track record for managing blood glucose levels during pregnancy makes it the preferred choice.