Profile (History, Chemical Structure, Characteristics)


Clenbuterol has been used as a bronchodilator for decades. Although the drug has a good safety records and is approved for use in many other countries, this combination has never been available for human use in the United States. 

In bodybuilding, Clen — as it's commonly referred to — plays a role of a powerful fat burner for final pre-stage body polishing. It will not make you lean if you're obviously overweight, but it will help you get rid of the last excessive body fat that stand between you and your physique goals.

Chemical structure

According to the chemical structure Clenbuterol is an activator of the beta-2 adrenoreceptors, which tremendously accelerates fat burning and stimulates the central nervous system. In addition, Clenbuterol has a strong anti-catabolic effect, i.e. it allows you to keep gained muscle mass, even during a strict diet and weight loss. That weight loss during the cutting phase is the main reason for Clenbuterol using.


Here is all you need to know about Clen before the cycle starts: 

  • Activity: about 68 hours
  • Classification: Beta-2-sympathomimetic / thermogenic / anti-catabolic (oral)
  • Dosage: Men 100-140 mcg / day. Women 80-100 mcg / day
  • Acne: No
  • Water retention: No
  • High blood pressure: sometimes
  • Hepatotoxicity: it is not recommended if you have problems with the liver
  • Suppression of HPTA function: No

Note that Clenbuterol should not be taken lightly (1): it's popular among PRO athletes only because they know how it works and how to get the best out of it safely, not because it's some sort of a magic fat burning pill. 


Here's the list of all things Clen can give you: 

  • Fat burning and lean muscles
  • Increased strength and endurance
  • Temperature increase
  • Decreased appetite
  • Mental activation
  • Anti-catabolic effect (2)
  • Anabolic effect.

Low rate of side effects (practice shows that irreversible side effects are almost completely absent) and the wide range of positive effects make Clenbuterol one of the best fat burners in bodybuilding.

Some authors argue that large doses of Clenbuterol may have catabolic effects, but this is not true, because of the absence of any physiological or empirical bases

Clenbuterol cycle guide

Dosages and Uses

Dosage: 120-140 mcg per day (for PROs), or as low as 40 mcg (for absolute beginners, splitted in 2x administration of 20 mcg ED).

Experienced athletes are recommended to take 120 - 140 mcg of Clenbuterol per day for the cutting. Women’s average Clenbuterol dose is 80-100 mcg per day for cutting and weight loss. Clenbuterol cycle has its subtle features which must be strictly followed to avoid side effects.

Clenbuterol Cycle Guide

  • Day 1: 20 mcg (0,02mg)
  • Day 2: 40 mcg (0,04mg)
  • Day 3: 60 mcg (0,06mg)
  • Day 4: 80 mcg (0,08mg)
  • Day 5: 100 mcg (0,10mg)
  • Day 6-12: 120 mcg (0,12mg)
  • Day 13: 80 mcg (0,08mg)
  • Day 14: 40 mcg (0,04mg)
  • Break (take a 1-2 weeks pause not to let the tolerance develop). 

Clenbuterol dose should be increased progressively during the first week. Optimal Clenbuterol time taking is morning (not to provoke insomnia, also in the morning drug efficacy is higher). When dosage is increased, start to take it 2 times: in the morning and afternoon.

Combined Clenbuterol Cycles

Ketotifen is antiallergic agent, with the unique ability to restore the sensitivity of the beta-2 adreno-receptors to Clenbuterol. This effect has been repeatedly proven during the studies. Ketotifen can accelerate the process of weight loss in 10-20% and prolong the cycle for up to 8 weeks. In addition, Ketotifen helps to eliminate mental stimulation, limbs tremor, insomnia, and palpitations.

  • Day 1: 20 mcg of Clenbuterol
  • Day 2: 40 mcg of Clenbuterol
  • Day 3: 60 mcg of Clenbuterol
  • Day 4: 80 mcg of Clenbuterol
  • Day 5: 100 mcg of Clenbuterol + 1 mg of Ketotifen
  • Days 6-27: 120 mcg of Clenbuterol + 2 mg of Ketotifen
  • Day 28: 80 mcg of Clenbuterol + 2 mg of Ketotifen
  • Day 29: 50 mcg of Clenbuterol + 1-2 mg of Ketotifen
  • Day 30: 33-35 mcg of Clenbuterol + 1 mg of Ketotifen
  • at least two weeks break

Ketotifen, in this case, should be taken at night, and Clenbuterol – in the morning. 


It's not a magic bullet but Clanbuterol can be a great help for your cycle, and especially — the final cutting phase. It will make your body look as dry as it is just possible. Just don't get used to the look: Clenbuterol abuse is plain dangerous for your health, and that look — even though low body fat is stunningly aesthetic — is not natural, it's not supposed to stay. Maintain a healthy lean look with a proper diet instead: it's way less dangerous. 

Join Our Community

To stay informed and get the news first — subscribe to our Telegram chat and join the Telegram channel.  Ask the most experienced athletes anything and get professional advice. The support team works 24/7 so you can get info on your order in the moment.


  1. A descriptive study of adverse events from clenbuterol misuse and abuse for weight loss and bodybuilding —
  2. Randomized, Double-Blind, and Placebo-Controlled Trial of Clenbuterol in Denervated Muscle Atrophy —