Potassium-sparing diuretics are a class of medications that help the body eliminate excess fluid while retaining potassium. Unlike other diuretics, they do not cause significant loss of potassium, which is essential for heart and muscle function. These medications are often used to treat conditions like hypertension and heart failure. Common examples of potassium-sparing diuretics include spironolactone and eplerenone. They work by blocking the action of hormones that promote sodium retention, leading to increased urine production. This helps reduce blood pressure and fluid buildup without depleting potassium levels in the body.