Aldosterone antagonists are a class of medications that block the action of aldosterone, a hormone produced by the adrenal glands. Aldosterone helps regulate blood pressure and fluid balance by promoting sodium retention and potassium excretion. By inhibiting this hormone, aldosterone antagonists help reduce fluid buildup and lower blood pressure, making them useful in treating conditions like heart failure and hypertension. Common examples of aldosterone antagonists include spironolactone and eplerenone. These medications can help improve heart function and reduce the risk of complications in patients with heart-related issues. However, they may also lead to increased potassium levels in the blood, so monitoring is essential during treatment.