Children’s nighttime cough has many causes, only meet the indications for the use of montelukast sodium as prescribed by the doctor, usually about 3 days to see the effect, but the specific time of effect should also be combined with the child’s cause of the disease and the onset of the disease and other comprehensive judgment. There are many causes of nocturnal cough in children, montelukast sodium is only used in the following cases: 1. for the prevention and long-term treatment of asthma in children between the ages of 2 and 14 years, including the prevention of daytime and nighttime asthma symptoms, the treatment of aspirin-sensitive asthmatics and the prevention of exercise-induced bronchoconstriction. 2. For the relief of symptoms caused by seasonal allergic rhinitis (seasonal allergic rhinitis and perennial allergic rhinitis in children aged 2 to 14 years). It should be noted that Montelukast Sodium relieves the inflammatory response of the airways and is not a cough suppressant per se, so it will not have an immediate effect in relieving cough. Usually after taking the drug for 3 days, the body will form a steady state blood concentration, which can effectively reduce the inflammatory response, reduce the symptoms of airway irritation, and thus reduce cough. Common adverse reactions to montelukast sodium are allergic reactions, central nervous system disorders, etc. It is contraindicated for those who are allergic to any component of this drug. In addition, the efficacy of this product in the treatment of acute asthma attacks has not been established. Montelukast Sodium needs to be taken under the guidance of a doctor, and should not be taken on its own to avoid adverse consequences.