Ethacrynic acid is a loop diuretic medication that is primarily used to treat edema or fluid retention caused by several medical conditions, including congestive heart failure, kidney or liver disease. Some of the synonyms for ethacrynic acid include Edecrin, Edecrin Sodium, Ethacrynicum Acidum, and Ethacrynate Sodium, among others. These synonyms are often used interchangeably in medical literature and discussions, and they all refer to the same medication. Ethacrynic acid works by preventing the body from absorbing too much salt, which in turn helps to reduce fluid buildup in the body. It is available by prescription only and should only be taken under the guidance of a healthcare provider.