Find out about Aldactone benefits, side effects, price, dose, how to use Aldactone , interactions and contraindications Aldactone 50 Tablet contains spironolactone (a short-acting diuretic), which works by increasing the amount of urine that is passed out from the kidneys. It effectively reduces excess fluid levels in the body and treats oedema (swelling) associated with heart, liver, kidney, or lung disease. Find patient medical information for Spironolactone ( Aldactone , Carospir) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Aldactone (spironolactone) is a diuretic that reduces edema and blood pressure by blocking aldosterone receptors. Learn about its indications, dosage, side effects, interactions, warnings, and precautions.