Cough is mostly seen in the airways with varying degrees of inflammatory reaction, with congestion, edema and even exudation of inflammatory secretions from their mucous membranes. At this time, you can choose some anti-allergic drugs to reduce the symptoms of cough, such as paracetamol, diphenhydramine, cetirizine, loratadine, desloratadine, fexofenadine tablets, as well as dexamethasone, methylprednisolone, prednisone, including fexofenadine. These drugs can reduce the state of airway congestion and edema to a certain extent, and also have a certain effect of relaxing the airway smooth muscle, which can make the airway open. They are more commonly used clinically for cough symptoms caused by wheezing bronchitis, bronchial asthma, cough variant asthma, etc.