What is Hydrochlorothiazide primarily used for?

Hydrochlorothiazide is primarily used as a diuretic, which means its main function is to promote the removal of excess fluid from the body. By increasing urine production, it helps to reduce blood pressure and minimize edema (swelling) caused by conditions such as heart failure or certain kidney disorders. This fluid removal is crucial in managing hypertension and other related cardiovascular issues, making it an essential medication in the treatment of those conditions.

Other options listed do not align with the primary purpose of Hydrochlorothiazide. Regulating blood sugar, managing respiratory issues, and treating cancer are functions associated with different classes of medications and are not relevant to the mechanism of action or therapeutic uses of Hydrochlorothiazide.