This principle is simple. Clenbuterol is essentially an agonist of B2 receptor, which can promote the relaxation and lipolysis of bronchial smooth muscle, and also cause the increase of blood sugar. Fat decomposition naturally reduces fat. Bricanyl, which we usually use, belongs to this kind of drug, but it also has a small amount of B 1 receptor stimulation, which can lead to peripheral vasodilation and tachycardia after long-term use.