Common clinical bronchodilators include: 1, anticholinergic drugs: such as tiotropium bromide, a long-acting agonist, can quickly relieve the spasm of bronchial smooth muscle; 2, β2 agonists: a short-acting agonist, can quickly relieve the spasm of bronchial smooth muscle, improve the patency of the airway; 3, methylxanthines: that is, theophylline drugs, divided into long-acting theophylline class and short-acting theophylline class, the effect is to relieve smooth muscle spasm, to improve the patency of the airway. The effect is to relieve the smooth muscle spasm and improve the patency of the airway to improve the symptoms of wheezing. The specific medication should be combined with clinical, by the doctor face-to-face guidance shall prevail.