clennex (clenbuterol hcl) is used as a bronchodilator and decongestant in patients suffering from asthma and other breathing disorders. It also acts as a thermogenic drug. It increases the metabolic rate of the body and also the rate at which body fat is broken down. It is often used by bodybuilders to "cut" fat. Clennex also increases aerobic capacity and oxygen transportation and has for performance enhancement in sports.