Both Ambroxol and Bromoxyn are often used in clinical practice for the treatment of respiratory diseases, and their main function is to help dissolve phlegm. It is the active metabolite of bromoxyn, so the expectorant effect is more obvious than that of bromoxyn. The duration of action of bromoxyn is longer, and the half-life of the drug is longer, and the adverse reactions are less than that of bromoxyn. In terms of pharmacological effects, Ambroxol has more functions, not only can play the role of phlegm, but also can promote the lung protection and the role of sputum excretion. Therefore, Ambroxol is widely used in clinical practice, and its clinical effect is better than that of bromoxyn.