Montelukast sodium is the generic phonetic name and belongs to leukotriene receptor antagonist, which mainly prevents and treats bronchial asthma and allergic rhinitis in children and adults. Asthma patients release a large amount of leukotriene inflammatory mediators in their bodies, and leukotrienes cause spasm in the airways and induce asthma attacks, triggering airway spasm and wheezing with croupy breathlessness. Monlustral is not a hormonal drug, so it is the drug of choice for asthma patients, especially for those who are afraid of hormone dependence and other side effects. It is especially suitable for patients with exercise-induced and drug-induced asthma, and can be used for a long time. Indications are asthma in children aged two years and older, adult asthma, allergic rhinitis, with side effects such as upper respiratory tract infections, bleeding tendency, allergic reactions, and mental system Side effects include upper respiratory tract infections, bleeding tendencies, allergic reactions and mental system disorders, abnormal gastrointestinal reactions, abnormal neurological symptoms, contraindicated in pregnant women and caution in elderly patients.