Final answer:
The nurse should prepare to administer potassium chloride to the client suspected of having hypokalemia due to the potential potassium loss caused by furosemide.
Step-by-step explanation:
The nurse should prepare to administer potassium chloride to the client suspected of having hypokalemia. Hypokalemia is a condition characterized by low levels of potassium in the blood. Furosemide, the medication the client currently takes, is a loop diuretic that can cause potassium loss. Therefore, administering potassium chloride can help replace the potassium that has been lost.