Clenbuterol is a long-acting beta-2 agonist, a drug that opens the airways and also acts on muscle and fat. In the US it is approved only as a veterinary syrup for horses with airway obstruction (Ventipulmin), not for people.
Also known as: Clen, Ventipulmin, clenbuterol hydrochloride.
FDA's animal drug rules list a syrup with 72.5 micrograms of clenbuterol hydrochloride per mL, for horses only. We found no clenbuterol product for people in FDA's Drugs@FDA database.
FDA's animal drug rules approve clenbuterol syrup for horses with airway obstruction such as equine COPD, restricted to use by or on the order of a licensed veterinarian. Federal law bans any extralabel use of clenbuterol in food-producing animals. There is no clenbuterol product approved for people in the US. WADA lists clenbuterol under "other anabolic agents" (S1.2), banned in and out of competition with no threshold; WADA notes that a low level in a sample can sometimes come from contaminated meat.
Poison centres see harm from people using it to lose weight or build muscle. Of 63 clenbuterol exposures reported to the New South Wales Poisons Information Centre in 2004 to 2012 (Brett 2014), at least 84% needed hospital care; the most common problems were a fast heart rate, stomach upset and tremor, and one 21-year-old man had a cardiac arrest. In 13 users reported to two poison centres (Spiller 2013), effects included a fast heart rate, fast breathing, low potassium, high blood sugar, chest pain, ECG changes and raised troponin, a sign of heart muscle injury, with effects lasting more than 24 hours.
There is no FDA label for people, and the poison-centre studies we cite do not give a half-life or time to peak, so we do not list one.
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