Which side effect should a nurse monitor for in a client taking hydrochlorothiazide?

A client taking hydrochlorothiazide should be monitored for hypokalemia because this medication is a thiazide diuretic that promotes the excretion of sodium and water from the kidneys, which also leads to the loss of potassium. When potassium levels fall below the normal range, the client may experience symptoms such as muscle weakness, fatigue, or arrhythmias, which can be critical.

It is essential to regularly check the client’s serum potassium levels while on hydrochlorothiazide therapy to prevent the potentially severe consequences of hypokalemia. The management of potassium levels may involve dietary adjustments or potassium supplementation if necessary. Understanding this side effect plays a crucial role in ensuring the healthcare provider can effectively manage the client's overall health and response to the medication.