The therapeutic effect of sputum excretion can be started a day or so after the administration of Ambroxol, which can promote the respiratory system, the secretion of the plasma glands of the respiratory mucosa, reduce the secretion of the mucus glands, and can reduce and break the mucopolysaccharides and fibers in the sputum, so that the sputum becomes thinner, the viscosity will be reduced, and it can be easily expelled. Therefore, Ambroxol is a drug that promotes sputum dilution and sputum discharge, and Ambroxol itself can also activate the surface active substance of alveolar epithelium, reduce the adhesion of mucus, and can promote the movement of cilia and accelerate the discharge of sputum. Clinically, it is mainly used in respiratory diseases with thick sputum or abnormal sputum excretion function and abnormal sputum secretion, including bronchitis, pneumonia, lung abscess, etc.