Lasix (also under the brand name SALIX) is a diuretic which can improve a bleeder's condition, but is known as a masking agent as well. Lasix was banned in New York state until the mid 1990's and was a major reason it was so hard for a 3 year old to sweep the triple crown, as the Belmont Stakes is run in NY. Pro's and con's on the drug, but it's always best to keep things simple so a total ban (i.e. Australia) is probably the best; unless the wheel's are in motion and it's too late to go back (i.e. USA).