Carbocisteine Oral Liquid has the effect of reducing the viscosity of sputum. Carbocisteine is a mucus modulator, which affects the secretion of bronchial glands mainly at the cellular level, increasing the secretion of low-viscosity salivary mucin and decreasing the production of high-viscosity fucoidan, thus making mucus less viscous and easier to cough up. Carbocistein is mainly used in the symptomatic treatment of chronic bronchitis, bronchial asthma, lung function ventilation insufficiency and other diseases; it can be used to alleviate chronic bronchitis, bronchial asthma and other diseases caused by sputum viscous, coughing up sputum difficulty and cause lung ventilation insufficiency of phlegm obstruction of the airways and so on. Allergic to the product, peptic ulcer in the active stage of patients is prohibited; a history of gastrointestinal disease, pregnancy and lactating women, allergies, bleeding tendency of gastric and duodenal ulcer patients should be used with caution. Carbocistein should be used under the guidance of a doctor.