Why do sulfonylureas like glipizide cause hypoglycemia, and what essential patient education is required?

• A. They inhibit hepatic glucose production; educate about hydration.
• B. They block glucose absorption; educate about high-fat meals.
• C. They stimulate pancreatic insulin release; educate about meals and recognizing hypoglycemia symptoms and carry fast-acting carbs.
• D. They increase insulin sensitivity; educate to skip meals.

Answer: (C)

Sulfonylureas stimulate insulin release from pancreatic beta cells by closing ATP-sensitive potassium channels, which depolarizes the cell and opens voltage-gated calcium channels. The resulting calcium influx triggers insulin secretion even when blood glucose isn’t high. That ongoing insulin release can push glucose down too far, especially if a meal is skipped or delayed, leading to hypoglycemia. Because of this, patient education focuses on matching drug effect with food and recognizing and treating low blood sugar promptly.

Explain to the patient that they should take the medication with meals or just before to align with carbohydrate intake, and never skip meals. They should be taught to recognize hypoglycemia symptoms (such as sweating, trembling, palpitations, confusion) and to carry fast-acting carbohydrates (like glucose tablets or juice) to treat lows quickly. Regular blood glucose monitoring is important, and they should limit or avoid alcohol which can increase hypoglycemia risk. Also discuss drug interactions and dose adjustments in liver or kidney impairment, and know what to do if symptoms persist or worsen.