Eplerenone is a prescription medication mainly used to treat high blood pressure (hypertension) and heart failure, particularly after a heart attack. It belongs to a class of drugs called aldosterone antagonists, which work by blocking the effects of aldosterone—a hormone that can cause fluid retention and raise blood pressure. By reducing excess fluid and lowering blood pressure, eplerenone helps decrease the risk of complications such as stroke, heart attack, and kidney damage. It is generally prescribed as part of long‑term management rather than a cure, and patients are advised not to stop taking it suddenly without medical supervision, since abrupt discontinuation can worsen cardiovascular conditions.