Dyazide contains a combination of hydrochlorothiazide and triamterene. Hydrochlorothiazide is a thiazide diuretic (water pill) that helps prevent your body from absorbing too much salt, which can cause fluid retention. Triamterene is a potassium-sparing diuretic that also prevents your body from absorbing too much salt and keeps your potassium levels from getting too low.
Dyazide is used to treat fluid retention (edema) and high blood pressure (hypertension). Dyazide may also be used for other purposes not listed in this medication guide.