Lasix (Furosemide)

ALTERNATIVE STEROID NAMES: Lasix, Furosemide, Frusemide.
Strength Gains: Strength gains 0/10
Mass & Weight Gains: Mass & Weight gains 0/10
Fat Burning: Fat burning 0/10
Cutting/Definition: Definition gains 10/10
Side Effects: Side effects 9/10
Ability to keep Gains: Ability to keep gains 0/10
Usual dosages: 20 – 80 mg per day
Detection time: NA
Best combined with:
Cutting: Aldactone
Beginner Use: Use for beginners 4/10
Female Use: Female use 8/10
Pros: Great pre-contest drug, Very cheap, Easily available.
Cons: Side effects, Dangerous.


Lasix is a brand name for the drug furosemide, a very potent diuretic. Technically it belongs to a class of drugs known as loop diuretics, which will cause the body to excrete water as well as potassium, sodium and chloride. Loop diuretics are among the strongest such drugs available, having an extremely dramatic effect on fluid levels in the body. Potassium levels need to be particularly watched, Lasix greatly increasing the amount excreted. The use of a prescription potassium supplement therefore is often required to keep levels in balance, otherwise a serious heart complications might develop. Mistakes in potassium dosage have equally serious consequences, so Lasix is clearly a risky item to use. But when an athlete needs to shed water, it is very difficult to find something that works better.

Athletes use diuretics for a couple of specific purposes. Competitive athletes use these drugs to drop water weight, in an effort to make adjustments in their weight class standings. Since the weigh-in is most often a day or days before a competition/match, one can drop their bodyweight considerably and be back to normal within hours after rehydration. This logically seems to provide an unfair advantage, the athlete competing at a much heavier weight than believed. This advantage is only offset by the now near universal nature of this practice. Bodybuilders also rely heavily on diuretics when preparing for a contest. It can efficiently lower subcutaneous water concentrations, helping to produce that super-ripped look so common on stage today. Make no mistake; a winning look is extremely difficult to obtain without some form of diuretic.

This drug is prepared as both an oral tablet (usually 20-40 mg per tablet) or IM/IV injection solution, the injection being much more rapid in effect. The dosage and method of administration is tailored to the individual, dependent on the desired goals and condition of the athlete. Tablets are the most common form of administration. Each oral Lasix tablet becomes effective about 1 hour after ingesting and will remain active for an additional 3 or 4 hours. The athlete will usually start with a mild dose, and add to this amount accordingly later in the day. The initial dosage is usually 20 to 40 mg, with the maximum amount usually not to exceed 80 mg. The user will attempt to calculate the optimal dosage, and determine the best intake schedule in relation to the show or competition. In order to minimize the side effects associated with this drug, it is generally used for no longer than a few days.

Since Lasix has such a strong effect on electrolyte and potassium levels, it is much safer to addition a potassium sparing agent like Aldactone® (spironolactone) than it is to keep increasing the amount of Lasix used. A combination of 50 mg Aldactone® and 20 mg Lasix would be a good starting point, having roughly the effect of a 40 mg Lasix tablet without the notable potassium loss. This dosage is repeated 2-3 times during the day and the effect judged to determine the optimal dosage. It is important to remember that these drugs can be active for many hours. It can become difficult to control the dehydrating effect with an overlapping schedule, so one should be careful not to administer such diuretics too frequently.

The injectable is a much more powerful version of the drug. It can be administered both intramuscularly and intravenously, depending on the intensity the user is looking for. The IV method is extremely fast, the strong effect of the drug felt in a matter of minutes. Since the injection is much more powerful than the oral, the dosage is to be considerably reduced in comparison. The injected dosage is usually in the range of 10-40 mg, rarely going any higher. Drug testing for Lasix at bodybuilding competitions has increased the popularity of last minute IV diuretic use, a very dangerous practice. Instead of slowly shedding water the few days prior, the user is forced to wait until after the “piss-test”. Then in a frantic rush to remove subcutaneous water before the show, the drug is administered. The user often has little time to adjust the dosage, resulting in a number of fatal mistakes in recent years. The effect of Lasix is actually easier to control with the injectable under normal conditions. When there is room to experiment, adjustments in dosage are much easier to make (the user not having to wait very long to see an effect). And the optimal dosage is certainly less trouble to calculate for a later time as well, the user having fewer variables to worry about. But again, when used in a rush this drug can be extremely dangerous.

Lasix is no doubt one of the most dangerous drugs a competitor will use. This can be seen on occasion when severe dehydration and electrolyte imbalance takes the life of an ambitious athlete. Warning signs that Lasix may be causing severe dehydration include (not limited to) dizziness, cramping, vomiting, diarrhea, fainting and circulatory disturbances. Potassium depletion can be marked as well, so as discussed users often opt to take a prescription potassium supplement, also with its own set of dangers. One should use extreme caution when considering using Lasix or other diuretics; they are certainly not needed for recreational users.

This product is widely available. It is manufactured and sold under many different brand names, in many countries. No version of Lasix (or any other diuretic) is currently being counterfeited. When found on the black market it can therefore be trusted. Although it is doubtful these will circulate, make sure never to purchase the 500 mg tablets. These are used only in severe medical conditions, and contain a dosage that could prove fatal to a healthy person.

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