Etanercept is commonly known as Ambrotyl, acetylcysteine and Ambrotyl do not exist which one is better at resolving phlegm, and the effect of resolving phlegm may vary for different patients. Acetylcysteine is suitable for the expectorant treatment of acute bronchitis, chronic bronchitis, bronchiectasis, chronic obstructive pulmonary disease, emphysema and other respiratory infections characterized by excessive mucous secretions. Contraindicated for those who are allergic to acetylcysteine. Use with caution in patients with bronchial asthma, and with caution in those with a history of peptic ulcer. Ambroterol is used for the treatment of cough, thick sputum, difficulty in expectoration and wheezing caused by acute and chronic bronchitis, bronchial asthma, emphysema and so on. Hypertrophic cardiomyopathy patients; allergic to the product is prohibited. Use with caution in patients with hyperthyroidism, hypertension, heart disease (cardiac insufficiency, arrhythmia, etc.), diabetes mellitus, and severe renal insufficiency. Therefore, there is no such thing as which one is better for reducing phlegm, Acetylcysteine and Ambroxol, and the choice needs to be made according to different patients and different diseases. All of the above drugs should be applied under the guidance of a doctor, avoid self-medication.