Allergic cough is not a separate disease, but refers to a persistent cough caused by allergic factors. It is mostly a paroxysmal dry cough and is caused by a variety of diseases, such as cough variant asthma, allergic cough, eosinophilic bronchitis, etc. The use of nebulized drugs includes two main categories: first, drugs to control airway inflammation, mainly glucocorticoids for nebulization, commonly budesonide, beclomethasone, fluticasone, etc. Glucocorticoids can relieve cough symptoms by controlling airway inflammation and anti-allergic effects. Second, bronchodilators, the main drugs are beta agonists and anticholinergic receptor drugs, such as Boliconi, salbutamol sulfate, tiotropium bromide, ipratropium bromide and so on, which can reduce airway hyperresponsiveness and relieve cough symptoms by dilating the bronchial smooth muscle and expanding the bronchus.