Acetylcysteine nebulizer is a drug treated by nebulized inhalation, mainly used for acute bronchitis, acute exacerbation of chronic bronchitis, and chronic obstructive emphysema. If there is a large amount of inflammatory secretions in the airways, blocking the airways, this drug can dissolve the secretions in the airways, such as sputum and sputum plugs, and can promote the discharge of secretions. The side effects of this drug are relatively few. Some patients may experience occasional allergic reactions, manifested as itching of the skin, hives, and more rarely, bronchial spasm, or even gastrointestinal irritation, such as nausea and vomiting. Patients can generally tolerate this nebulizer treatment and can continue to use it in most cases.