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. Additionally, eplerenone is often prescribed after a heart attack to improve survival rates in patients with left ventricular dysfunction. It is important for patients to follow their healthcare provider's instructions regarding dosage and potential side effects, which may include dizziness or elevated potassium levels.