Substances: Clenbuterol

Clenbuterol is a sympathomimetic that acts mainly on beta-adrenergic receptors.  As such it is classified under the category of other anabolic agents. Its main action is to relax smooth muscle in the airways.

In addition, the actions of clenbuterol may mimic the actions of adrenalin or amphetamines due to its stimulant effect on the heart and the central nervous system.

Clenbuterol is also used in animals as a partitioning agent, that is, it can increase lean muscle mass and reduce fat.

Side effects

Side effects are common and a major problem with its use.  They include increased heart rate, palpitations, tremor and insomnia.  It may also cause a rise in blood pressure and an increase in anxiety.

Status in Sport

Clenbuterol is prohibited both in and out of competition under the World Anti-Doping Code 2007 Prohibited List (effective from 01/01/07).

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This page last updated Tuesday, January 22, 2008

Copyright © 2008, Australian Sports Anti-Doping Authority (ASADA)