How do sulfonylureas lower glucose and what major risk must be monitored?

How do sulfonylureas lower glucose and what major risk must be monitored?

• A. Stimulate pancreatic beta-cell insulin release; risk of hypoglycemia; caution with alcohol due to disulfiram-like reaction; monitor kidney function
• B. Decrease hepatic glucose production; risk of lactic acidosis
• C. Delay gastric emptying; risk of GI upset
• D. Improve insulin sensitivity only in muscle; risk of weight gain

Answer: (A)

Sulfonylureas lower blood glucose by increasing the pancreas’s own insulin output. They bind to receptors on the beta cells and close the ATP-sensitive potassium channels, causing the cells to depolarize and calcium to enter. This triggers insulin-containing granules to be released, pushing glucose from the blood into tissues. Because this raises insulin levels, it can lower glucose regardless of current glucose levels, which is why hypoglycemia is the major risk to monitor. Context helps: while this class effectively lowers fasting and postprandial glucose, its insulin-releasing action means the body can overshoot if meals are delayed or skipped, or if alcohol is involved—certain older agents can cause a disulfiram-like reaction with alcohol. Monitoring kidney function is also important because reduced clearance can raise hypoglycemia risk and require dose adjustments.

Sulfonylureas lower blood glucose by increasing the pancreas’s own insulin output. They bind to receptors on the beta cells and close the ATP-sensitive potassium channels, causing the cells to depolarize and calcium to enter. This triggers insulin-containing granules to be released, pushing glucose from the blood into tissues. Because this raises insulin levels, it can lower glucose regardless of current glucose levels, which is why hypoglycemia is the major risk to monitor.

Context helps: while this class effectively lowers fasting and postprandial glucose, its insulin-releasing action means the body can overshoot if meals are delayed or skipped, or if alcohol is involved—certain older agents can cause a disulfiram-like reaction with alcohol. Monitoring kidney function is also important because reduced clearance can raise hypoglycemia risk and require dose adjustments.