The medication used to reduce phlegm for nebulized inhalation therapy does not always have to be hormonal. In addition to hormones, there are other medications that can be used to reduce phlegm, such as Ambroxol injection, chymotrypsin, and others. They can make the sticky phlegm become very thin, which can make the phlegm flow more smoothly, and can be easily discharged through the airway. Clinically, these medications can be chosen for patients who have a lot of phlegm and very little water inside the phlegm, which may cause the airway to have poor phlegm expulsion or even cause phlegm plugs, resulting in airway obstruction and dyspnea. After nebulized inhalation treatment, these drugs can make the phlegm discharge smooth, can make the airway obvious symptoms of dyspnea reduced, with good effect.