ETHACRYNIC ACID reduces swelling related to heart, kidney, liver, or lung disease. It may also be used to reduce swelling caused by cancer. It helps your kidneys remove more fluid and salt from your blood through the urine. It belongs to a group of medications called diuretics. Get Ethacrynic Acid for as low as $33.26, which is 94% off the average retail price of $532.37 for the most common version, by using a GoodRx coupon.