The drug Clenbuterol is a β2 agonist with some structural and pharmacological similarities to epinephrine (adrenaline). Therapeutically, clenbuterol is a fantastic bronchodilator and has been approved by the FDA for use in horses for the management of airway obstruction. If a horse has mucus in the throat there is nothing better on the market that can clean it up and help the horse get to the racetrack. That is the good. Clenbuterol is also the drug that cyclist Alberto Conta