Clenbuterol is a β2-adrenergic agonist and bronchodilator developed for the treatment of various breathing disorders such as inflammatory airway disease (IAD) and recurrent airway obstruction (RAO).
Clenbuterol is an effective anti-asthma medication that has been approved for use in humans by prescription since 1977 in several countries.
Clenbuterol demonstrates strong anabolic effects in animals, significantly increasing skeletal muscle mass while decreasing fat.
This led to bodybuilders purchasing clenbuterol on the black market and using it in cutting cycles along with other fat-burning steroids.
Benefits of Clenbuterol
- fat loss;
- increased blood flow;
- improved energy;
- appetite suppression;
- diuretic;
- no testosterone suppression.
Fat Loss
Clenbuterol stimulates the central nervous system (CNS), thereby increasing the release of adrenaline and raising body temperature by as much as 1 degree.
Consequently, in an attempt to maintain homeostasis, the body stimulates the sweat glands to cool to their previous temperature.
This constant "cooling effect" increases overall calorie expenditure, thereby increasing the user's basal metabolic rate.
Increased blood flow
Clenbuterol increases adrenaline levels, putting the body into fight or flight mode. Consequently, blood flow throughout the body improves, which is a survival mechanism.
Thus, we have seen that clenbuterol improves muscle endurance, allowing bodybuilders to perform more repetitions than usual in less time.
Note. If a person's blood pressure or heart rate increases excessively, taking clenbuterol may reduce stamina; thus, these benefits depend on the individual and how they respond to clenbuterol.
Improved Energy
Pre-workout supplements are popular due to the presence of stimulants in their formulas, such as caffeine, which provide an intense workout.
Stimulants stimulate the central nervous system, causing the body to release more adrenaline and providing a significant boost of energy.
Appetite suppression
Clenbuterol has a stimulating effect on beta-2-adrenergic receptors, which may affect satiety levels in humans.
This effect may indirectly promote further fat loss, as people are less likely to cave in and overeat their favorite high-calorie foods.
Diuretic means
Clenbuterol doesn't just burn fat; it also flushes out extracellular water. This can cause a person to look noticeably slimmer and have improved muscle tone.
We associate the diuretic effect of clenbuterol with profuse sweating.
Any water lost as a result of taking clenbuterol will return after the cycle, making this diuretic effect temporary.
No testosterone suppression
One of the biggest disadvantages we see with the use of anabolic steroids is the interruption of natural testosterone production.
Typically, after a course of steroids, it may take several weeks or months for endogenous testosterone to return to normal levels.
However, clenbuterol (unlike anabolic steroids) does not reduce testosterone levels. This way, PCT is not required and you don't have to worry about losing your results.

Clenbuterol dosage
A person's dosage will depend on what they are using clenbuterol for.
For example, an asthmatic may take two 20 mcg tablets per day.
Patients suffering from more severe respiratory conditions may take four 20 mcg tablets per day.
However, bodybuilders or those taking clenbuterol for weight loss can take 6-8 tablets per day (120-160 mcg). Such dosages are well outside the therapeutic range used in medicine; therefore, more serious side effects should be expected.
People respond differently to powerful stimulants; thus, the dosage should be tailored to how sensitive the person is to the drug.
Unlike anabolic steroids, the dosage of Clenbuterol is the same for men and women. This is because it affects the central nervous system rather than hormonal levels (women have significantly less testosterone and therefore require lower doses of steroids to achieve the same level of results).
Clenbuterol course for men and women
The following course is taken by men and women who want maximum fat loss and a high level of muscle definition.
Days |
Clenbuterol |
1-3 |
20 mcg |
4-6 |
30 mcg |
7-9 |
40 mcg |
10-12 |
50 mcg |
13-15 |
60 mcg |
16-18 |
70 mcg |
19-21 |
80 mcg |
22-24 |
90 mcg |
25-27 |
100 mcg |
28-30 |
110 mcg |
One should continue to increase the dosage only until he reaches the maximum amount at which he is comfortable with the side effects.
The reason clenbuterol cycles typically do not last longer than 4-6 weeks is due to beta-receptor suppression.
Thus, the positive effects of clenbuterol can only be felt for a limited time until the body restores its temperature to normal levels, which will stop fat burning.
For the same reason, some athletes prefer to take clenbuterol for 2 weeks followed by a 2-week break or 2 days on and 2 days off.
Clenbuterol and Anavar course for women
Anavar (Oxandrolone), unlike Winstrol (Stanozolol), is more suitable for women due to its low degree of masculinization.
The clenbuterol and Anavar cycle is taken by women who want to look lean and strong, not skinny.
Thus, female celebrities are more likely to only take clenbuterol, while athletes or serious weightlifters may add Anavar.
Days |
Clenbuterol |
Anavar |
1-3 |
20 mcg |
5 mg |
4-6 |
30 mcg |
5 mg |
7-9 |
40 mcg |
10 mg |
10-12 |
50 mcg |
10 mg |
13-15 |
60 mcg |
10 mg |
16-18 |
70 mcg |
10 mg |
19-21 |
80 mcg |
10 mg |
22-24 |
90 mcg |
10 mg |
25-27 |
100 mcg |
10 mg |
28-30 |
110 mcg |
10 mg |
Clenbuterol and Cytomel cycle (T3)
Clenbuterol can also be combined with Cytomel (T3) to speed up fat burning. Cytomel is a prescription medicine for hypothyroidism (underactive thyroid).
Simply put, the higher a person's T3 level, the higher the rate of lipolysis (fat burning) in the body.
This complex is considered the ideal duo for burning fat among bodybuilders who want to pump up before competition; however, it is not without serious side effects.
- Athletes often take 25–75 mcg of Cytomel per day for 6–8 weeks.
- 50 mcg is the standard dose for intermediate bodybuilders.
However, bodybuilders often combine Cytomel with testosterone or another anabolic steroid due to the catabolic effects of Cytomel on muscle tissue.
Is Clenbuterol safe?
The Peking Union Medical College in Beijing, China, concluded that clenbuterol has only minor effects in rabbits.
However, when higher doses were administered, the heart rate increased sharply, causing severe hypotension.
Thus, research suggests that the safety of clenbuterol may be dose-dependent.
Note. Men and women with existing heart problems are at great risk when taking clenbuterol (regardless of the dose). Additionally, if athletes combine clenbuterol with anabolic steroids, cardiovascular side effects will be exacerbated.
Is weight loss from clenbuterol permanent?
Yes, all results from clenbuterol are permanent and will not be reversed after the course.
However, a person must continue to exercise and eat properly if they want to maintain their results.
Note. Loss of water is the only temporary effect; therefore, people can restore a small amount of fluid after the cycle is completed.
Side effects of Clenbuterol
- increased heart rate (palpitations);
- anxiety (shaking);
- insomnia.
Increased heart rate
Clenbuterol stimulates the sympathetic nervous system, causing an excessive increase in resting heart rate. The drug helps increase the heart rate to 180 beats per minute.
Therefore, clenbuterol is a particularly dangerous drug for those with heart problems or high blood pressure.
Anxiety
Anxiety is a common side effect of taking clenbuterol due to its tendency to put a person into fight or flight mode. Over-arousal of the central nervous system can cause a person to perceive everyday situations as threats, negatively impacting their mental health.
Rapid heartbeat and palpitations can also cause anxiety as people may think they are having a heart attack.
Insomnia
Insomnia is common among clenbuterol users due to an overactive nervous system causing hyperactivity.
It's worth noting that sleep deprivation can increase cortisol levels, further raising blood pressure and inhibiting fat burning.
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