Clenbuterol, commonly referred to as Clen, is a powerful stimulant used by athletes to burn off fat. It works by increasing body temperature and heat production. Like all stimulants, Clen can be addictive and cause unwanted side effects such as excessive heart rate, dry mouth, restlessness, insomnia and loss of appetite. Smaller doses are recommended for first-time users and increasing to no more than 200 mcgs/day. Clen should be used in cycles to allow the body to recover and using an antihistamine like Benadryl or Ketotifen during off cycles is recommended.
Clenbuterol is a widely used bronchodilator in many parts of the world. The drug is most often prepared in 20mcg tablets, but it is also available in syrup and injectable form. Clenbuterol belongs to a broad group of drugs knows as sympathomimetics. These drugs affect that sympathetic nervous system in a wide number of ways, largely mediated by the distribution of adrenoceptors. There are actually nine different types of these receptors in the body, which are classified as either alpha or beta and further subcategorized by type number. Depending on the specific affinities of these agents for the various receptors, they can potentially be used in the treatment of conditions such as asthma, hypertension, cardiovascular shock, arrhythmias, migraine headaches and anaphylactic shock. The text Goodman and Gillman’s The Pharmacological Basis of Therapeutics Edition does a good job of describing the diverse nature in which these drugs affect the body: