Mineralocorticoid receptor antagonists block the action of aldosterone, a hormone that causes your body to retain sodium and water. This action helps the body get rid of excess salt and water. Mineralocorticoid receptor antagonists are used to treat heart failure, high blood pressure, and high aldosterone levels. They can also help with fluid retention caused by certain kidney or liver problems. Examples include spironolactone (Aldactone), eplerenone (Inspra), and finerenone (Kerendia).