Yes.
Lasix is given via intravenous injection four hours before a race. It starts working in about 5 minutes to make a horse urinate. It\'s peak effect is in about 30 minutes to an hour. Then it\'s half-life is 2 hours or so.
That means that, four hours after the shot, when the horse runs, there isn\'t even a therapeutic dose left in the horses system.
Lasix is only used during a race, or during a hard work - not for regular training. That\'s because EIPH is a recognized problem of all horse breeds that work at speed and great intensity: race horses, barrel racers, weight-pulling horses, cross-country horses.
Why would you allow a horses lungs to be damaged by EIPH if you can help prevent it?
Lasix is a good theraputic drug for Exercise-Induced Pulmonary Hemorrhage. There is zero reason to ban it. Steve Zorn wrote a 100% accurate article. Very nice.
It \"enhances performance\", the same way an athlete who has asthma \"enhances performance\" by taking his asthma inhaler before he runs. The same way your grandma \"enhances her performance\" by taking her lasix pill (her \"water pill\") so she can breath due to her congestive heart failure and her lungs don\'t feel wet.