Clenbuterol for weight loss

, medical expert
Last reviewed: 10.08.2022

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The drug Clenbuterol refers to the pharmacological group of beta-adrenomimetics for the treatment of bronchopulmonary diseases. However, the presence of a number of metabolic effects in this medicine, gave rise to the practice of using clenbuterol for weight loss, which the physicians disapproved of.

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Indications for use

According to the official instruction, Clenbuterol (other trade names - Contraspazmin, Spiropent) has such indications for use:

  • Chronical bronchitis;
  • bronchial asthma;
  • chronic obstructive pulmonary disease (COPD);
  • dust bronchitis and pulmonary fibrosis with silicosis;
  • emphysema of the lungs;
  • pulmonary tuberculosis.

Form of the preparation: tablets of 0.02 mg; syrup (in bottles of 100 ml).


The mechanism of action of Clenbuterol on the bronchi and lungs - the removal of spasms, a decrease in mucus production, a decrease in its viscosity and an improvement in excretion - is provided by the active substance - clenbuterol hydrochloride, which is 4-amino-alpha (tert-butylamino) methyl-3,5-dichlorobenzyl alcohol. At beta-2-adrenoreceptors, Clenbuterol has the same effect as adrenaline and norepinephrine, that is, it excites them. When interacting with the membrane enzyme of AC in cells, the concentration of cyclic adenosine monophosphate (cAMP) increases and protein kinases are inactivated. As a result, inhibition of the transmission of the inflammatory signal of the immune cells of the bronchi and lungs and the relaxation of their muscle fibers occur.

But this drug also affects beta-1-adrenoreceptors of the heart and beta-3-adrenoreceptors, which are localized in adipose tissue. Thus, Clenbuterol for weight loss works by stimulating beta-3-adrenoreceptors, which leads to a metabolic effect - increased heat production and activation of lipolysis. In addition, there is an anabolic effect of this drug, which is due to a positive effect on the synthesis of proteins. For this reason, in sports medicine, the drug is considered doping and is prohibited.


After ingestion, Clenbuterol for weight loss is absorbed into the digestive tract and enters the systemic circulation; bioavailability is 89-98%. The half-life lasts more than 24 hours, residual levels of active substance are detected in the blood after 48 hours after a single use.

Clenbuterol is cleaved in the liver by gluconizing (conjugation with glucuronic acid), excretion of metabolites is through the kidneys.

How to drink Clenbuterol for weight loss?

Begin to drink Clenbuterol for weight loss should be with a minimum daily dose of 20 mcg (one tablet of 0.02 mg), the maximum daily dose - 120 mcg. For men, the initial dose is 40 mcg (two tablets) per day, the maximum daily intake is 140 mcg.

There are two schemes for taking Clenbuterol for weight loss - "explosive" and conventional

According to the first scheme (popular with bodybuilders) for 14 days, the drug is taken, starting with a minimum of 20-40 μg, with an increase in dosage daily or every other day. By the end of the second week, the daily dose should be 100-140 mcg (5-7 tablets). Then a two-week break is made, after which the reception resumes from a dose of 100-140 μg.

With this method, the main problem is that the use of beta-adrenomimetics leads to addiction, and stopping the intake of tablets slows the metabolism.

The second scheme is recognized as the best, which involves a gradual increase in the dose from the initial 20 μg to 100 μg for 14-17 days. Also there is an option: within four weeks the minimum dose is taken without an increase.

Clenbuterol can not be used for more than 16 weeks in one calendar year.

Overdose of Clenbuterol causes an increase in side effects: tremor, arrhythmias and frequent heart rhythms, falling blood pressure, psychoneurological disorders. Significant overdose is fraught with cardiac arrest.

Clenbuterol and Thyroxin for weight loss

Thyroxine (L-thyroxine, Levothyroxine, Eutirox, Eferox) - a synthetic analogue of thyroid hormones - is used to compensate for the deficiency of endogenous thyroid hormones in hypothyroidism of various etiologies.

Joint use of drugs Clenbuterol and Thyroxin for weight loss supporters of medical weight loss explain that thyroxine affects metabolism, activating the splitting of proteins and lipids. See more details - Thyroid hormones for weight loss

An increase in the daily dose gives side effects, in particular, a decrease in appetite and body weight, sleep disorders, diarrhea and vomiting, tremor, tachycardia, excessive sweating, unbalance, anxiety and increased anxiety.

Analogues of Clenbuterol for weight loss : Salbutomol, Ventolin, Iazdrin (Bronchodilatin, Neoepinephrine, Neodrenal, Ritodrin, Euspiran, etc.), Terbutaline (Brikanil), Fenoterol (Partusisten), Hexoprenaline.

Reviews of doctors about Clenbuterol for weight loss are unequivocally negative: the use of drugs not for their intended purpose can only harm their health. Thus, the use of this drug leads to a disruption in the balance of thyroid hormones in the development of secondary hypothyroidism.

Analyzing the reviews of those who lose weight about Clenbuterol for weight loss, we can conclude that the use of this drug leads not only to weight loss (an average of 2-3 kg per week), but also to deterioration of well-being.

Storage conditions: away from sunlight, at room temperature.

Shelf life - 24 months.

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Contraindications for use

Contraindications to the use of Clenbuterol are individual hypersensitivity, thyrotoxicosis, cardiac arrhythmia with tachycardia, hypertrophic obstructive cardiomyopathy, acute myocardial infarction.

Use during pregnancy - in the first three months and a month before the birth - is contraindicated.

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Side effects

The use of clenbuterol for weight loss most often causes side effects manifested by tachycardia, changes in blood pressure downward, trembling of the hands, dry mouth, nausea, urticaria. Also there are headaches, insomnia, a state of heightened anxiety and nervousness.

The use of clenbuterol for weight reduction activates the cleavage of glycogen in the liver (glycogenolysis), which leads to an increase in the sugar content in the blood with possible hyperglycemia. In addition, the drug can cause loss of potassium and a decrease in the synthesis of taurine, which causes muscle spasms.

The most dangerous side effect of this drug is ventricular hypertrophy.

Interactions with other drugs

Clenbuterol is incompatible with preparations of the group of beta-blockers. Simultaneous reception with drugs to reduce blood sugar levels the effect of the latter. Clenbuterol increases the risk of extrasystole when used with cardiac glycosides.


To simplify the perception of information, this instruction for use of the drug "Clenbuterol for weight loss" translated and presented in a special form on the basis of the official instructions for medical use of the drug. Before use read the annotation that came directly to medicines.

Description provided for informational purposes and is not a guide to self-healing. The need for this drug, the purpose of the treatment regimen, methods and dose of the drug is determined solely by the attending physician. Self-medication is dangerous for your health.

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