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. It is a beta-2 agonist, with properties somewhat similar to adrenaline. Clenbuterol acts as a CNS stimulant and users quite commonly report side effects such as shaky hands, insomnia, sweating, increased blood pressure and nausea. These side effects generally subside quickly once the user becomes accustomed to the drug. Athletes find clen attractive for it s pronounced thermogenic effects as well as mild anabolic properties. Dosage regimes will vary depending on the desired effect. Generally comes in 20mcg tablets, although it is also available in syrup and injectable form. Clenbuterol 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.