Which one is more effective, Ambroterol or Compound Folcodine, cannot be generalized, because they belong to different drugs and treat different diseases. 1. Ambroterol: By increasing the secretion of respiratory plasma and reducing the secretion of mucus, it reduces the viscosity of sputum and promotes the discharge of sputum. It is suitable for acute and chronic respiratory diseases causing difficulty in sputum expulsion. Adverse reactions include headache, drowsiness, cardiac arrhythmia, and allergic rash. Contraindications include allergy to the product, patients with chronic hypertrophic cardiomyopathy. 2. Folcodine: It is a central cough suppressant by selectively acting on the medullary cough center to play the role of cough suppression. It is suitable for dry cough and sensitive cough caused by influenza and respiratory tract irritation. Adverse reactions include drowsiness, vomiting, constipation and so on. Contraindications include severe hypertension, coronary heart disease, allergy to the product, etc. Since the two drugs, Ambroterol and Compound Folcodine, have different effects and different indications, they should be selected under the guidance of a doctor and according to the specific cause of the disease.