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Aldosterone Antagonists are drugs that act as diuretics (water pills), but whose main action is to block the response to the hormone aldosterone. This hormone promotes the retention of sodium (salt), the loss of magnesium and potassium, blood vessel damage and other heart damage. These drugs increase urination, reducing water and salt while retaining potassium. They help lower blood pressure, increase the pumping ability of the heart and help protect the heart in heart failure.
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