White phlegm is usually caused by respiratory diseases, and if the phlegm is thick, it can be treated with Ambroxol to resolve the phlegm. White sputum is white sputum that is coughed up by a person. This symptom is usually caused by respiratory diseases such as pharyngitis, acute and chronic bronchitis, pneumonia, etc. Ambroxol is a mucolytic drug that can reduce the viscosity of sputum and dissolve sputum. Ambroxol is a mucolytic drug that can reduce the viscosity of phlegm and promote the discharge of phlegm, and can be used to treat thick phlegm and coughing difficulties caused by various acute and chronic respiratory diseases. Before using Ambroxol, it should be noted that it is contraindicated in women in the first trimester of pregnancy and in those who are allergic to the drug. Also the application of the drug may cause adverse reactions such as nausea, rash, stomach upset, abdominal pain, diarrhea. Avoid concomitant use of dextromethorphan or other central cough suppressants while using Ambroxol. Coughing sputum patients are advised to consult a doctor in a timely manner, improve the relevant laboratory tests to clarify the cause of the disease, to give targeted treatment, to avoid blindly using their own medication.