Chemical Name: TORSEMIDE (TORE-se-mide) Dermadex belongs to the group of medicines called loop diuretics. Demadex is given to help reduce the amount of water in the body in certain conditions, such as congestive heart failure, severe liver disease (cirrhosis), or kidney disease. It works by acting on the kidneys to increase the flow of urine. Dispensed from a jurisdiction where this item is approved for sale.