A nurse is providing teaching to a client who has hypertension and a new prescription for hydrochlorothiazide. Which of the following instructions should the nurse provide?

A. Hydrochlorothiazide is a thiazide diuretic, and it is best taken in the morning to avoid frequent nighttime urination. This helps maintain the diuretic effect during the day without disturbing sleep. B. Weight monitoring is essential but not a primary method for determining therapeutic effectiveness of hydrochlorothiazide. Blood pressure monitoring is more directly related to its effectiveness. C. Muscle pain is not an expected side effect of hydrochlorothiazide. It may cause muscle weakness or cramping due to electrolyte imbalances, particularly hypokalemia, but not muscle pain. D. Hydrochlorothiazide can be taken with or without food, and it does not require an empty stomach for proper absorption.