Montelukast is used in the clinical treatment of many children. Montelukast is a leukotriene receptor blocker, which can effectively control airway inflammation in children and is mainly used in children with allergic rhinitis and bronchial asthma. Allergic rhinitis in children may cause nasal congestion, runny nose, sneezing and other symptoms, which may seriously affect children’s health. The application of montelukast can effectively control the inflammation in children’s nasal cavity, improve the symptoms of allergic rhinitis and improve the quality of life of children. Similarly, if children with asthma have recurrent cough, shortness of breath and croup in the lungs, montelukast can also be used to control the inflammation in the respiratory tract and reduce the airway hyperreactivity. When airway hyperreactivity is reduced, the frequency of coughing and shortness of breath in children will be reduced.