Intravenous infusion of theophylline, such as doxorubicin and aminophylline. 3. Intravenous infusion of glucocorticoids, such as methylprednisolone, can be changed to oral and gradually changed to inhalation medication after symptoms are controlled. 4. Combined infection requires antibiotics, such as penicillin or cephalosporins, and severe infection requires carbapenem antibiotics, such as imipenem-cistatin sodium. If the condition deteriorates rapidly and respiratory failure occurs, in addition to the above drugs, non-invasive ventilator assisted ventilation or even invasive ventilator assisted ventilation needs to be given.