Eplerenone is a medication primarily used to treat high blood pressure and heart failure. It belongs to a class of drugs known as aldosterone antagonists, which work by blocking the effects of the hormone aldosterone. This helps the body retain potassium while promoting the excretion of sodium and water, leading to lower blood pressure and reduced strain on the heart. Eplerenone is often prescribed after a heart attack to improve survival rates in patients with left ventricular dysfunction. It is typically taken as an oral tablet and may be used in combination with other medications to enhance its effectiveness in managing cardiovascular conditions.