A nurse is caring for a client who has heart failure and a new prescription for furosemide. For which of the following adverse effects should the nurse monitor?

A. Hypoglycemia is not a common side effect of furosemide. B. Furosemide is a diuretic that promotes fluid loss, so hypervolemia (excess fluid) is unlikely. C. Furosemide usually lowers blood pressure; hypertension is not typical. D. Furosemide can cause hypokalemia (low potassium levels) due to increased potassium excretion, which requires monitoring.