Lasix is not a hormone compound but a diuretic. Lasix belongs to the group of saluretics and to be exact is a loop diuretic. Lasix effect consists of distinctly increased excretion of sodium, chloride, potassium, and water. Due to its intense effect on water excretion Lasix is used for treatment of edemas and high blood pressure. Bodybuilders use Lasix shortly before a competition to excrete excessive, mostly subcutaneous, water so that they appear hard, defined, and ripped to the bone when in the limelight. The amount of the dosage, the duration of application, and the intervals of intake usually depend on the diuretic effect or the athlete's shape... -- more about LASIX --