Triamterene is primarily used as a diuretic to help the body eliminate excess fluid while retaining potassium. It is often prescribed to manage conditions like hypertension (high blood pressure) and edema (fluid retention) associated with heart failure, liver cirrhosis, or kidney disorders. By blocking sodium channels in the kidneys, it reduces sodium reabsorption and increases urine production, which helps lower blood pressure and alleviate swelling. It is frequently combined with other diuretics, such as hydrochlorothiazide, to enhance its effectiveness and minimize potassium loss. However, it requires careful monitoring to avoid potential side effects like hyperkalemia (high potassium levels).