A client with a history of heart failure is prescribed furosemide 40 mg PO daily. The nurse should monitor for which electrolyte imbalance as a common side effect of this medication?

✓ Correct Answer: Option B

Furosemide is a loop diuretic that inhibits sodium and chloride reabsorption in the loop of Henle, leading to increased excretion of water, sodium, chloride, and potassium. Hypokalemia is a common and serious side effect.