Clenbuterol is a beta-receptor agonist drug used in the treatment of asthma and in bodybuilding for the purpose of fat loss. In some instances, it can also be used to enhance performance in endurance exercise. Clenbuterol should only be used when fat loss needs to be particularly accelerated over a relatively short period of time. For example, if the need or intent is to lose only 1 lb of fat per week, then there are better means to do this than to use Clenbuterol. Where fat loss efforts are already maximized or near-maximized, however, Clenbuterol use can add perhaps another 1 lb per week to the rate of loss.