Cardalis is a mixture of two drugs commonly used in the treatment of congestive heart failure. So it conveniently gives two drugs in one tablet. These drugs are Spironolactone – a diuretic and Benazepril Hydrochloride – an ACE inhibitor. Spironolactone causes an increase in urination and so helps get rid of congesting fluids and it has protective action on cardiac muscle helping to prevent fibrosis. Benazepril Hydrochloride basically reduces blood pressure which simply put allows each heart beat to go further. It comes in three sizes of tablet.