Clenbuterol, medically used throughout many parts of the world as a broncodilator for the treatment of asthma, is a recent and popular addition to the realm of athletics. Clenbuterol is a beta-2 agonist, with properties somewhat similar to adrenaline.
Clenbuterol generally come is 20mcg tablets, although it is also available in syrup and injectable form. Users will usually tailor there dosage individually, depending on results and side effects, but somewhere in the range of 2-8 tablets per day is most common.
For fat loss, clenbuterol seems to stay effective for 3-6 weeks, then it's thermogenic properties seem to subside. This is noticed when the body temperature drops back to normal. It's anabolic properties subside much quicker, somewhere around 18 days.
Currently, counterfeits of clenbuterol do exist, but they are scarce and most are bottles with loose tablets. Clenbuterol should only be trusted when purchased in foil and plastic strips, preferably with accompanying box and paperwork.
Clenbuterol helps keep the gains you've made on the Dianabol and other steroid cycles.