No, they are not the same. They do, however, treat hypertension, but in different ways. Triamterene (HCTZ, or hydrochlorithiazide) is a potassium-sparing diuretic. It helps to eliminate excess fluids through the kidneys and urine, thereby decreasing the blood pressure. Hydralazine is a vasodilator, which will allow the blood to flow more easily, but is only a temporary fix without the diuretic. They are commonly used together to treat pernicious hypertension.
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