Generic Aldactone drugs are used to treat congestive heart failure. Spironolactone is a potassium-sparing diuretic (water pill) that is useful to stop your body from engrossing extra salt and keeps your potassium levels from getting too low. Generic Aldactone is also used to analyze and treat a condition in which you have over aldosterone in your body. Aldosterone is a hormone created by your adrenal glands for regulating the salt and water stability in your body. Spironolactone also helps to treat fluid preservation (edema) in people with congestive heart failure, cirrhosis of the liver, or a kidney disorder called nephrotic syndrome.