I just found this blurb from BigCat after a google search. This helps some and some may find useful.
"Furosemide / Lasix Stacking and Use:
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."