Ambroxol Oral Liquid is a mucolytic agent, which can increase the secretion of plasma glands of respiratory mucosa and decrease the secretion of mucous glands, thus reducing the viscosity of sputum, promoting the secretion of lung surface active substances, increasing the movement of bronchial cilia, and making sputum easy to cough up. It is suitable for acute and chronic respiratory diseases, such as acute and chronic bronchitis, bronchial asthma, bronchial dilatation, pulmonary tuberculosis, etc. caused by sputum viscous, coughing up sputum difficulty.