The use of different drugs for nebulization has different effects, which are described as follows: 1. Use budesonide: it can reduce local congestion and edema, and also reduce airway hyperresponsiveness, for example, when the patient has cough variant asthma or asthma, budesonide can be given for nebulization; 2. Use ipratropium bromide, salbutamol: it can effectively relieve bronchospasm and stretch the bronchi to calm asthma; 3. Use amiloride or acetylcysteine: clinically, it can play the role of diluting sputum and promoting sputum discharge.