If you use nebulized inhalation to dissolve phlegm, you have to choose the nebulized form of the drug, the more commonly used is acetylcysteine, the trade name is Fulusi, because there are two forms of Fulusi, one is the oral form and the other is the nebulized form, when choosing the nebulized form, you have to choose the nebulized form only, like the oral form of Fulusi and the static form of Ambroxol, this form can not be used for nebulization. Generally, 2-4 ml of sterile water or saline plus one acetylcysteine should be added to the nebulizer, and it can be nebulized 2-3 times a day. In addition to these, it is also possible to use static or oral phlegm medication, but if nebulized inhalation is used, only the nebulized form should be used.