How to take montelukast sodium granules is based on different ages and conditions. For children 1-2 years old with asthma, take 4mg once a day. for children 2-5 years old with asthma, or 2-5 years old with allergic rhinitis, you can take 4mg once a day, also once a day. For adults with asthma or allergic rhinitis, the dose can be doubled and taken once a day at 8mg once a day, for asthma patients can be taken at bedtime. For patients with allergic rhinitis, choose the time period to take it according to the frequency and specific duration of their rhinitis attacks. For patients suffering from both allergic rhinitis and asthma, you can take it once a day at night, during the attack period of the disease, and still insist on taking it for a period of time during the remission period of the disease. The dosage and interval can be adjusted according to different conditions, and it takes about 1-3 months.