Which condition increases hypoglycemia risk with sulfonylureas or insulin due to impaired clearance?

• A. Normal renal function
• B. Renal impairment
• C. Liver disease
• D. Hypertension

Answer: (B)

The reason this increases hypoglycemia risk is that drug clearance governs how long and how much of the drug is active in the body. When clearance is reduced, drugs and their active metabolites stay in circulation longer, causing a longer- and stronger-glucose-lowering effect.

Renal impairment specifically lowers the kidneys’ ability to clear insulin and many sulfonylurea metabolites. With reduced kidney function, these agents stay in the bloodstream longer, leading to higher and more prolonged insulin activity and a greater danger of hypoglycemia. While liver disease can alter drug metabolism, the scenario described—impaired clearance leading to more hypoglycemia with these agents—points to decreased renal clearance as the main factor. Hypertension doesn’t directly affect drug clearance, and normal renal function would not elevate this risk.