Montelukast is montelukast sodium. A course of montelukast sodium for variant asthma needs to be used for at least 3 months to control its clinical symptoms. Montelukast sodium is mainly used for the prevention and long-term treatment of asthma in adults, the treatment course of Montelukast sodium is different for different diseases, if it is used for the treatment of croup variant asthma, and if it can achieve the effective control of asthma, the treatment program should be maintained for three months, and the treatment may be downgraded after three months, and the medication may be gradually reduced. When variant asthma occurs, it is necessary to go to the hospital in time, and not to use the drug blindly, in order to avoid adverse reactions, such as palpitations, dizziness, fatigue, diarrhea, dyspepsia, vomiting, skin rash, urticaria, joint pain and other symptoms. It should be noted that it is contraindicated for those who are allergic to any of the ingredients in this product.