A new study shows that horses treated with a diuretic before racing had less hemorrhaging in their airways and lungs during exercise.
Use of furosemide, which is sold as Lasix and Salix, to treat pulmonary hemorrhaging in racehorses began in the 1970s. The study seemingly fuels the argument that Lasix should be administered to horses on the day of a race. That practice is legal in the United States, but most countries ban the use the drug on race-day because it enhances performance.