The side effects of Lasix...negative are too numerous to mention...animals + humans.

So how much weight does a horse lose with treatment? You might be surprised. Researchers found that when feed, hay and water were withheld for 4 hours, untreated horses lost an average of 9 pounds. Horses treated with 150mg (3cc) furosemide lost 28 pounds, those treated with 250mg (5cc) lost 31.5 pounds and those treated with 500mg (10cc) lost 32 pounds.

I don’t have any direct knowledge of horses, but they sweat a lot. Thus I think having them in a dehydrated state going into a big effort of a race could be quite harmful.

This is a good response Dogs, Thanks, your last line says a lot and The Who of The Racing Industry needs to be 

shaken out of the tree and identified  and its time to debate them imo.

that is terrible !

What's the best way to recover from this ,or best treatment . 

Anybody know.

BTW Horses Sweat, Men Perspire, Ladies Glow !

This medication may cause dehydration and electrolyte imbalance.  serious side effects: muscle cramps, weakness, unusual tiredness, confusion, severe dizziness, fainting, drowsiness, unusual dry mouth/thirst, nausea, vomiting, fast/irregular heartbeat.

Yet millions of humans take it..

But horses before maximum exercertion.

Perhaps kidney damage/failure is the highest risk.

Cheaper tag races IMO use the diaretic to run the horse weighing like 32 pounds less. And before coming to track on layoff use L to shed water weight gain of say 5%

It also effects calcium levels in the body increasing the possibility of fractures

Releases potassium..a big deal.

And as mentioned the low level claiming tracks may have a horse off for 9 months and Lasix 100-150 lbs of water out of horse

Dat would be a lot of water.

Every time I read that a horse has suddenly succumbed to colic I wonder if they were on Lasix and/or Bute long term.

Yes indeed, just would some instant test so betting folks arent immediately screwed. Not sure how it would work but those are the folks who got burnt with a three month later decision. How do we fix that? We loose followers if it keeps happening.