Clenbuterol: a high-risk burner

Many pages can be written about slimming properties of green tea, bitter orange and the cayenne pepper, at the same time indicating their desired influence on fat burning and the security of their application. However, there are people who do not seek compromises, those for whom effectiveness is the only thing that matters. An example of a controversial solution that is used both by high performance athletes and amateurs is a drug called clenbuterol, also known as "clen". Although misused can be a threat not only to your health, but also life, this drug has one advantage: it burns fat. We are not talking about subtle effects on lipolysis and thermogenesis but about a drastic acceleration of your metabolism rate.

What is "clen"?

Clenbuterol is a drug included in the beta2-agonists-adrenergic group used to treat bronchial asthma (contrary to what some say is not a steroid!). In European countries and in the United States, the drug was withdrawn from the market in 1988 after one of big scandals, but is still used in veterinary medicine. Clenbuterol dilates the bronchi, and what is particularly important for people who use it as part of an illegal support, it strongly increases thermogenesis leading to increased energy expenditure. In addition, this measure raises blood pressure and works stimulatingly on the central nervous system.

How does "clen" work?

In fact, the clenbuterol can be compared to the ephedrine but it should be emphasised that it is much stronger. This substance increases the activity of catecholamines (epinephrine, norepinephrine and dopamine), which, on the one hand, influences flexion of smooth muscle (relax airways smooth muscles and cause vasoconstriction), and, on the other hand, intensifies processes of themogenesis and lipolysis. Catecholamines are energizing, they stimulate to action, increase alertness and positively affect the oxygenation of muscle tissue, which increases your effort capacity. So as you can see, clenbuterol can be used not only as a burner, but also as a stimulant and a substance which improves endurance.

Who uses "clen"?

Clenbuterol is used by both high performance athletes and amateurs who build their body "at home". This drug has been used as illegal doping among representatives of bodybuilding disciplines where it is used primarily to improve the aesthetics of the body and to get rid of excessive body fat (combined with anabolic-androgenic steroids such as testosterone and its analogs) and also taken by athletes who take part in strength disciplines (quite famous is a mixture of clenbuterol and erythropoietin used by some competitors during a race).


Clenbuterol's dosage as illegal doping is has a very personal characted and largely depends on personal sensitivity to this medication. Quite often a treatment starts from a minimum dose (20-40 mcg/day) and successfully its amount is increased to the maximal dose of 120-160 mcg/day. In most cases the dose oscillates within the range of 60-100 mcg/day and turns out to be optimal. Opinions on duration of the cycle are divided; some sources indicate that the best solution is to take clen for a period of 3-4 weeks, but there are studies suggesting that this drug can be taken for 6, even up to 8 weeks. There are also alternative systems according to which clen should be taken for about 2 weeks according to this scheme: alternately 2 days of taking/1 day of break; then you change the drug into another one, such as ephedrine and take it for two more weeks.

Combination with other drugs

Clenbuterol is often combined with anabolic-androgenic steroids with a low level of aromatisation. It should be remembered that in case of orally administrated drugs there is an increased risk of liver damage – clen also heavily affects this organ, what unfortunatelly is not widely known. Some sportsmen combine this drug with thyroid hormones (T3), which, on the one hand, leads to a drastic drastic metabolism acceleration, at the same fat burning, but on the other, it significantly increases the risk of developing side effects and overdosage. What may turn out to be exceptionally dangerous is a combination of clenbuterol with ephedrine and yohimbine.

Side effects

The use of clenbuterol as illegal aid, of course, entails the risk of side effects. Already a small dose of this medication can cause tachycardia, muscle tremor, nervousness or slowing down, increased blood pressure. At higher doses these effects worsen, and in addition to the above, one can also observe chest pain, nausea, vomiting, heartburn, insomnia and others. Symptoms of overdose may have sudden and unpleasant character, and make a threat to your health and even life. Cases of severe poisoning by clenbuterol are known to science. Absolute contraindications to the use of this drug are cardiovascular disease (including hypertension) and nervous system diseases. It is interesting to know that studies on animals have shown that the use of high doses of clenbuterol causes permanent changes in the testes, livers and muscles.

To sum up

Clenbuterol is surely proving to be a very helpful addition to work on the body fat reduction. The effects resulting from its application combined with a good diet and proper training can be spectacular. Unfortunately, the use of clenbuterol is associated with a high risk of side effects, some of which are onerous (trembling muscles and hands), while others may simply be dangerous. Neither the author of this article nor the owners and administrators of favour the use of any prohibited doping substances. This article serves only informational purposes.