Shunrnin, commonly known as montelukast sodium, is used in the treatment of asthma and allergic rhinitis, and is divided into tablets, granules and chewable tablets. Generally, asthma patients should take it before bedtime; allergic rhinitis patients can take it as needed according to their own conditions; patients suffering from both asthma and allergic rhinitis should take the medicine once a night. 1.Montelukast Sodium Tablets: 10mg/tablet, one tablet once daily for patients aged 15 years and above. 2. Montelukast Sodium Granules: 4mg/bag, mostly used in infants and children, for patients aged 1 to 5 years, 4mg can be taken once a day, also once a day. 3. montelukast sodium chewable tablets: 4mg/tablet or 5mg/tablet, 5mg once a day for patients aged 6 to 14 years old; 4mg once a day for patients aged 2 to 5 years old. Montelukast sodium is forbidden to use for allergic people, pregnant women and lactating women, and if you are using other drugs, you should communicate with your doctor in time to avoid drug interactions. Some patients may experience adverse reactions such as rash, itching, nausea, vomiting and fever when taking Montelukast Sodium. Due to the use of montelukast sodium in different dosage forms, the use of different methods, patients should be standardized under the guidance of the doctor, to avoid blind use of drugs caused by adverse reactions.