Ambroxol injection is a mucolytic agent, mainly used in acute and chronic bronchitis, bronchial asthma, bronchial dilatation, tuberculosis and other causes of sputum mucus and breathing difficulties. The specific dosage is mainly through subcutaneous intramuscular injection twice a day, 30mg-45mg once; intravenous injection is 1.2mg-1.6mg per kg of body weight total per day, in 3 times, usually within 2-3 minutes of slow intravenous injection. Some patients will have adverse reactions, it should be noted that patients who are allergic to the drug during the use is prohibited. It may cause headache, leg pain and fatigue during rapid intravenous injection, and should be used with caution for stomach ulcers and pregnant women within 3 months of pregnancy.