The nurse is administering desmopressin (DDAVP) to a pediatric client with diabetes insipidus. The nurse should monitor for which of the following potential side effects of this medication?

A. Hypoglycemia: Desmopressin does not affect blood glucose levels. Hypoglycemia is not a recognized side effect of this medication. B. Hypertension: While desmopressin can cause fluid retention, significant hypertension is uncommon in pediatric clients when dosing is appropriate and fluid intake is monitored. C. Hyponatremia: Desmopressin promotes water reabsorption in the kidneys, which can dilute serum sodium and lead to hyponatremia. Monitoring for signs such as headache, nausea, or confusion is essential to prevent complications. D. Hyperkalemia: Desmopressin does not impact potassium levels directly. Hyperkalemia is not associated with its use in treating diabetes insipidus.