Montelukast sodium can be given to children on a long-term basis, but it must be indicated for use. Because montelukast sodium is a leukotriene receptor antagonist, it is mainly used in children who are allergic. If children are allergic, they will suffer from allergic rhinitis and bronchial asthma, which often require anti-allergic treatment. Some children are resistant to glucocorticosteroids or their parents do not want to give them glucocorticosteroids, so montelukast sodium is used. The onset of action of montelukast sodium is chronic, and only long-term application can reduce airway hyperreactivity and improve allergic status in children, and generally the treatment course of montelukast sodium is more than three months.