A nurse is administering spironolactone at 0800 to a client who has heart failure. The nurse should monitor the client for which of the following adverse effects?

A. Spironolactone is not associated with hypophosphatemia. B. Spironolactone is a potassium-sparing diuretic, and hyperkalemia is a potential adverse effect due to reduced potassium excretion. C. Spironolactone is not associated with hypocalcemia. D. Spironolactone is not associated with hypernatremia; rather, it promotes sodium excretion.