Clenbuterol is a mdicines used to treat asthma , it actions to dilate the airways when these are narrowed because of asthma attack. This medication acts like adrenaline , a substance that is produced in our body and prepares the body for fast action , stress and training. During the cycle with Clenbuterol it increases the temperature, the metabolism becomes faster and the apptite becomes not so big. The optimal dose depends on each users's body, on his reaction to this medication, but is not indicates to take a dose over 200mcg daily. In the moment when the body temperature becomes normal it is good to take a pause with the cycle because the body adapted to him and there is no effect anymore. This pause is good to be taken about 2 weeks , but the whole cycle should not exceed 12 weeks. Bodybuilders use clenbuterol more for definition , because it increases strengh, vascularity and tone.