Ambroxol tablets, a commonly used expectorant, is a mucolytic agent that increases the secretion of plasma glands in the respiratory mucosa and reduces the secretion of mucus glands, thereby decreasing the viscosity of sputum. Ambroxol can also promote the secretion of lung surface active substances and increase the movement of bronchial cilia, so that sputum can be easily coughed out. Therefore, it is clinically indicated for those whose sputum is sticky and not easy to be coughed out. The dose for adults is 30mg-60mg once, 3 times a day, after meals. Generally, the adverse reactions of Ambroxol are mild, but allergic people should use it with caution. Rash, nausea, stomach discomfort, lack of appetite, abdominal pain and diarrhea are occasionally seen when using it. It should also be avoided when used together with central cough suppressants such as dextromethorphan to prevent the airway from being blocked by diluted sputum. This drug only has a certain effect on cough symptoms. When using it, attention should be paid to the cause of coughing and coughing sputum, and treatment should be directed at the cause.