Children’s montelukast sodium can be taken orally for about 2 weeks to 3 months, depending on the needs of the condition. Montelukast Sodium is a leukotriene receptor antagonist used for the treatment of allergic rhinitis and asthma. If used for the treatment of allergic rhinitis, it is generally recommended to take it orally for 2 to 3 weeks, and if there is no significant relief of symptoms, you need to go to the hospital and change the medication under the guidance of your doctor. If used for the treatment of asthma, it is recommended to take 3 months, and then evaluate the treatment according to the condition, consider whether to change the treatment plan or gradually reduce the dosage, try not to exceed 6 months. It is contraindicated for people who are allergic to montelukast, and used with caution in children under 6 months of age. Abnormal mental status, such as aggressive behavior, may occur after taking the drug. Drowsiness, dizziness, cold-like symptoms, gastrointestinal discomfort, etc. may occur after taking the drug, and most of them improve on their own after stopping the drug. The exact duration of how long your child takes Menlustat needs to be seen in the hospital, and the duration of treatment will be adjusted according to the condition of the child as well as the condition of the drug after taking it.