Montelukast Sodium can be taken for a long time. Montelukast Sodium is indicated for the prophylaxis and long-term treatment of asthma in children over 1 year of age. Montelukast Sodium has a high affinity and selectivity for type I cysteinyl leukotriene receptors, and can effectively inhibit the physiological effects of cysteinyl leukotriene binding to type I cysteinyl leukotriene receptors without any agonist activity. It is indicated for the prophylaxis and long-term treatment of asthma in children over the age of 1 year, including the prevention of daytime and nocturnal asthma symptoms, the treatment of aspirin-sensitive asthmatics and the prevention of exercise-induced bronchoconstriction. Montelukast Sodium is well tolerated with mild adverse effects, mainly abdominal pain, drowsiness, thirst, headache, vomiting and psychomotor overload. The occurrence of these symptoms should be promptly treated in the hospital. Patients should use Montelukast Sodium as prescribed by the doctor, do not adjust the dose or stop the drug by yourself, so as not to affect the efficacy of treatment and adverse reactions.