Lasix is a brand name for the drug furosemide, a diuretic. When taken, one will excrete water as well as potassium, sodium and chloride from the body. It is used by competitive athletes for weight class adjustment and bodybuilders before a contest to lower water concentrations inside the muscle. The end result is quick weight loss and in the case ofbodybuilders, that super-ripped look we see during competitions. This is a potentially dangerous drug, as seen on occasion when severe dehydration and electrolyte imbalance takes the life of an ambitious athlete. One should use extreme caution when considering using lasix or other diuretics, and it certainly not needed for non-competitors. This substance is available as an oral tablet or IM/IV injection solution. Drug testing for Lasix at bodybuilding competitions has led many to avoid the tablets and take larger risks with intravenous administration in an attempt to avoid using it until after the "piss-test". It is available in many different preparations in many countries, none of which are currently being counterfeited