The main drugs that can relieve bronchospasm are as follows: 1. β2 agonists, such as salbutamol and terbutaline, which can dilate the bronchi and can be administered orally and by nebulized inhalation. 2. Cholinergic receptor antagonists, such as ipratropium bromide, which can also be administered by nebulized inhalation, and compound preparations of these drugs, such as the oral compound Methotrexate capsules, which can significantly relax the already spastic bronchial smooth muscle and can dilate the airway. It is mainly used to relieve wheezing, shortness of breath and chest tightness during acute attacks of wheezing bronchitis and bronchial asthma.