The common use of this diuretic is:
But it is commonly used by athletes for:
https://www.cbssports.com/mlb/news/what-is-furosemide-the-diuretic-substance-that-got-robinson-cano-an-80-game-ped-suspension-by-mlb/
http://www.espn.com/mlb/story/_/id/23513249/drug-ban-crushing-blow-robinson-cano-hall-fame-case
Furosemide is used in treating a variety of conditions, per WebMD. The list includes heart failure, and disease of the liver or kidney, as well as helping treat high blood pressure. Within the context of professional sports, an athlete is unlikely to be suffering from heart failure or other major diseases. High blood pressure is another story, as some do deal with it.
But it is commonly used by athletes for:
Perhaps obviously, furosemide can be used as a masking agent, helping the body rid itself of evidence of doping through urination before testing occurs. Hence why it, among other diuretics, is banned by the World Anti-Doping Agency. Note that furosemide (and similar products) are most effective at avoiding detection when paired with a fast-moving stimulant.
https://www.cbssports.com/mlb/news/what-is-furosemide-the-diuretic-substance-that-got-robinson-cano-an-80-game-ped-suspension-by-mlb/
http://www.espn.com/mlb/story/_/id/23513249/drug-ban-crushing-blow-robinson-cano-hall-fame-case