Neutral protease is a protein hydrolyzing enzyme, mainly through hydrolysis to break down fibrin, thus reducing the viscosity of sputum and playing a role in dissolving sputum. It is used in the treatment of chronic bronchitis causing sputum viscous symptoms. The adverse reactions of Neutral Protease Enteric-Coated Tablets are not clear at present. Patients are prohibited from taking this medicine when the color and properties of the medicine have changed, and children should be used under adult supervision. Neutral protease enteric-coated tablets are easily destroyed under acidic conditions, so they should be swallowed whole and not chewed or broken. Patients who need to use the neutral protease enteric coated tablets please consult a professional doctor, under the guidance of the doctor to follow the doctor’s instructions, the rational use of medication.