The suffix for potassium-sparing diuretics is -actone.Examples: spironolactone, aldactoneAction: Increase the fluid excreted by the kidneys, while retaining potassium in the body. Reduces cardiovascular congestion and edema that results from CHF. Also lowers blood pressure.The suffix for thiazide diuretics is -thiazide.Examples: hydrochlorothiazideAction: Increases fluid and potassium excreted by the kidneys. Reduces cardiovascular congestion and edema that results from CHF. Also lowers blood pressure.