Ivadine is used to treat heart failure. Ivadine is used by adults to help prevent the heart failure from getting worse and needing treatment in a hospital. Ivadine is also used by children who have heart failure due to an enlarged heart. Heart failure is a condition where your heart does not pump blood as well as it should. Ivadine works by slowing the heart rate so the heart can pump more blood through the body each time it beats. Ivadine is available in strengths of 5 and 7.5 mg.