Erdostein capsule belongs to the mucous phlegm dissolving agent, through the mucin disulfide bond breakage, reduce the viscosity of sputum, thus conducive to sputum discharge, but also has the enhancement of mucosal cilia operation, also conducive to the discharge of sputum. It is clinically used in the treatment of acute and chronic bronchitis and obstructive chronic obstructive pulmonary disease in which sputum is thick and not easy to cough out. This product can lead to mild gastrointestinal reactions after administration, manifested as nausea and dry mouth, diarrhea and abdominal pain and other symptoms. Note that patients with severe hepatic and renal insufficiency are prohibited. Special populations: avoid use in pregnant lactating women, this product is not suitable for children under 15 years of age, the elderly do not need to adjust the dose. This product should be avoided in combination with strong cough suppressants, sputum may block the airway and cause infection. Patients should use the drug under the guidance of a medical professional and strictly follow medical advice.