Montelukast Sodium usually works within 1 week, but the drug needs to be used in full dosage and course of treatment, the specific time of taking the drug also needs to follow the doctor’s instructions, do not stop or use the drug on your own. Montelukast sodium belongs to the leukotriene receptor antagonist, this drug is mainly used for asthma prevention and long-term treatment. Adverse effects of this drug are mild and often include abdominal pain and headache. Pregnant women need to be cautious about taking this medication and it should not be used in the treatment of acute asthma attacks. Due to the huge individual differences and the inconsistency of each person’s condition, the effect of the drug is not the same for each person. Usually, patients are advised to take the drug consistently regardless of whether they are in the stage of asthma control or in the stage of deterioration. However, the drug needs to be stopped after 1~2 weeks to observe the effect of the drug, it is recommended to continue to take about 3 months. If any significant adverse reaction occurs, the drug should be stopped immediately and the doctor consulted. If you need to take Montelukast sodium, be sure to take it correctly under the guidance of a doctor, take and stop the medication according to the doctor’s instructions, and do not stop the medication on your own to avoid causing the progression of the disease and bringing more harm to the body.