It signals the body to immediately excrete both intracellular and extracellular water, and with it the key electrolytes sodium and potassium. This can lead to severe problems. Muscle contraction is based on the exchange of electrolytes. That means in first instance an electrolyte imbalance can causing cramping and other irregularities in muscle contraction. Now if its only a calf or a bicep, no harm done in the long run. But when its your heart muscle, that's another story. In 1985 professional bodybuilder Mohammed "Momo" Benazziza fell dead after winning a Grand Prix, the cause of death was believed to be his pre-contest use of the diuretic Lasix.
In most sports diuretics are used to lose small amounts of weight in a hurt. If you compete in weight classes and need to drop a pound in an hour, lasix will do the trick for you. Cleans the water from your body and you are lighter. If you have a match the next day, you are probably heavier again, so a major advantage. In bodybuilding the use of diuretics is for another reason entirely. The aim is after all to show as much muscle as possible, and to show as much definition and striation within that muscle. Unfortunately even at the dangerously low body-fat percentages bodybuilders compete at, a lot of that definition may still be hidden under layers of subcutaneous water. By using diuretics, that water can be shed and the maximum potential of a physique can be retained. In many cases, the levels of water retained by an athlete has made the difference between doing very well and doing very poorly. And the differences in the water household between the pre-judging of a contest and the evening show have sometimes made the difference between several placings. So diuretics have become an integral part of bodybuilding over the last 20 years.
Furosemide comes in oral tablets of 20 and 40 mg and in an injectable form. The injectable is the most potent. Its injected intravenously, as opposed to most steroids which are injected intramuscularly. It can become active in a matter of minutes and has a drastic effect. But as described previously, also a very dangerous one. The orals will usually take 60-90 minutes to kick in, but have a fairly drastic effect themselves. Furosemide is without a doubt the most potent diuretic in the world. An athlete will rarely opt to take more than 40 mg daily, and only in the last 4 or 5 days leading up to a show. The Injectable version is only used pre-contest, especially if there is testing. Testing for diuretics has become very popular in bodybuilding of late, and that has driven more athletes to wait until after taking their piss, and then inject some Lasix to get rid of the last bit of water. Needless to say this is a reckless practice. If a stronger effect is required, athletes are more likely to opt for adding another, milder diuretic like spironolactone (Aldactone), instead of increasing the dosage of lasix. There are a number of combination diuretics like Lasilactone that enjoy great popularity in the sports sector. Usually they near the potency of using twice as much lasix, but with much less hazard.
Since its so harmful and potentially lifethreatening, furosemide should only be used the last 4-7 days leading up to a contest, with around 20 mg a day, 40 mg at the very most. If a stronger effect is needed, additioning a milder diuretic is advised. 50 mg of spironolactone or hydrochlorthiazide, which are potassium sparing diuretics, will usually do the trick. Adding a potassium supplement to furosemide is wise, 1500-3000 mg daily normally. This keeps electrolytes somewhat in balance and helps prevent the worst of side effects such as nausea, dizziness and cramping. There isn't much use for ancillary drugs with furosemide otherwise. Its an anti-hypertensive in itself, so it could offer relief after a dieting period with ephedrine, clenbuterol and high dose androgens. One should always take care to replenish his water and salt intake after use is discontinued.
Many users will note a very distinct bloating after discontinuing the product, sometimes to the point where everyday movement is near impossible. During the use of this product extremely heavy and painful cramps can occur, as well as Diarrhea, dehydration, dry mouth, dizziness and nausea. If the injectable is used, make sure its out of necessity. Otherwise I would caution you to stay away from it. If you do, a small amount injected into a vein will have an impact within minutes. Make sure you addition some potassium to it immediately, and have someone watching your back at all times. Keeping a shot of epinephrine handy just in case is not being overly cautious..