Clenbuterol cycle 101

Clenbuterol cycle 101

Clenbuterol has long been the fat burner of choice for many bodybuilders and athletes alike, favourably possessing both thermogenic and anti-catabolic properties.

Often referred to simply as “Clen”, Clenbuterol is a stimulant and is used in the medical world to treat the likes of asthma and other breathing disorders. It is not a steroid, and its popularity among bodybuilders and athletes is mainly down to its ability to increase fat loss via thermogenesis.

Clenbuterol as a fat burner

Clenbuterol is an effective fat burner due to its ability to increase the body’s core temperature, which in turn increases the number of calories expended over a given time. A rough figure sometimes quoted is a one degree (Fahrenheit) increase in core body temperature through thermogenesis can heighten calorie expenditure by 4-5%.

Combined with Clenbuterol’s thermogenic properties is its ability to prevent muscle breakdown, in other words, its anti-catabolic properties. This is of great interest to bodybuilders and athletes who are trying to shed fat, which often involves the dual catabolic activities of cardio and dieting.

Dosages for a Clenbuterol cycle

Clenbuterol SopharmaAlthough Clenbuterol is available in other forms, it is most commonly taken as a tablet, dosed in micrograms. Being a powerful stimulant, Clenbuterol quickly causes the down regulation of the receptors, and is therefore best taken in short cycles for maximum effect.

With the half-life of the drug being 36-48 hours, concentrations can remain elevated in the body for several days after admission. This is something we have to keep in mind when planning an effective Clenbuterol cycle. As mentioned, Clenbuterol is best taken in short cycles to maximise its effects, but given its long half-life only taking a few days off will not allow enough time for the up-regulation of the receptors. So, in general, a minimal of 10-14 days should be taken off in-between cycles, with a cycle itself lasting up to two weeks.

If it is your first time using Clenbuterol it would be wise to slowly raise the dosage over the initial two week cycle to gauge your tolerance to the drug. A wise choice may be to start off with an initial dose of one 20mcg tablet on the first day, and increase this dose by a tablet a day until you reach a maximum dose of 120-140mcg (6-7 20mcg tablets). When you begin your second cycle after a two week break you can start close to your maximum dose, beginning with say 80mcg on the first day and increasing it by one tablet a day until you again reach your maximum dosage of 120-140mcg.

Such a Clenbuterol cycle is illustrated below.

Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7
20mcg 40mcg 60mcg 80mcg 100mcg 120mcg 140mcg
Day 8 Day 9 Day 10 Day 11 Day 12 Day 13 Day 14
140mcg 140mcg 140mcg 140mcg 140mcg 140mcg 140mcg
Day 15 Day 16 Day 17 Day 18 Day 19 Day 20 Day 21
OFF
Day 22 Day 23 Day 24 Day 25 Day 26 Day 27 Day 28
OFF
Day 29 Day 30 Day 31 Day 32 Day 33 Day 34 Day 35
80mcg 100mcg 120mcg 140mcg 140mcg 140mcg 140mcg
Day 36 Day 37 Day 38 Day 39 Day 40 Day 41 Day 42
140mcg 140mcg 140mcg 140mcg 140mcg 140mcg 140mcg
Day 43 Day 44 Day 45 Day 46 Day 47 Day 48 Day 49
OFF
Day 50 Day 51 Day 52 Day 53 Day 54 Day 55 Day 56
OFF

The total length of the two week on/off Clenbuterol cycling should not exceed 10-12 weeks, after which it would be wise to take an extended break from its use. This usually works well for bodybuilders and athletes who use Clenbuterol during the summer months to aid with fat loss, in conjunction with their training program and diet.

Clenbuterol side effects

Other andrenoceptor agonists, such as the ECA stack or ephedrine, should be avoided whilst on a Clenbuterol cycle.  It would also be advisable for anyone with hypertension or cardiac conditions to avoid the use of Clenbuterol altogether.

There is a range of common side effects, which are usually dose dependant and subside after continued use, these include:

  • High blood pressure
  • Heightened heart rate (Tachycardia)
  • Nervousness
  • Headaches
  • Muscle cramps
  • Hand shakes
  • Nausea

Taking Ketotifen with Clenbuterol

As previously mentioned, taking Clenbuterol quickly results in the down-regulation of the beta 2 receptors; limiting the amount of time the drug is effective.

Ketotifen, an anti-histamine used commonly to treat itchy red eyes brought on by allergies, has been shown to stop the down-regulation of the beta receptors, and is therefore of great interest to bodybuilders and athletes. A daily dose of 3mg of Ketotifen cleans the receptors, discarding the need for short Clenbuterol cycles and heightening the effect of the drug in the body.

With Ketotifen, you can limit your maximum daily dosage of Clenbuterol to 80-100mcg.

Anabolic Guru

With over 25 years’ experience of performance enhancing drug use in bodybuilding and elite sport, Anabolic Guru shares his/her valuable insights and knowledge.



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