Fenoterol is a beta-adrenergic agonist similar to clenbuterol. In the literature, fenoterol has been shown to have greater anabolic effect than clenbuterol1. Since most people do not notice much of an anabolic effect with clenbuterol, it is unclear is any anabolic effect would be noticed with fenoterol. Even though fenoterol has been shown to have anabolic effects, like clenbuterol, these effects will not be comparable to those of AAS. Fenoterol would have similar effects to clenbuterol with regard to fat loss2. Fenoterol was removed from the market in the US due to the potential for overdose. The use of beta agonists for weight loss is quite common. This is due to the fact that they increase thermogenesis, increase fat burning and stimulate the CNS. The down side is the cardiac risk that is common to this class of medications. Increased heart rate, blood pressure, and direct effects on cardiac contractility as well as potential heart enlargement are potentially dangerous side effects; particularly when combined with androgens.
1. Ryall JG, Gregorevic P, Plant DR, Sillence MN, Lynch GS. Beta 2-agonist fenoterol has greater effects on contractile function of rat skeletal muscles than clenbuterol. Am J Physiol Regul Integr Comp Physiol. 283(6):R1386-94, 2002
2. Emery PW, Rothwell NJ, Stock MJ, Winter PD: Chronic effects of beta 2-adrenergic agonists on body composition and protein synthesis in the rat. Biosci Rep. Jan;4(1):83-91, 1984