Montelukast is a leukotriene receptor antagonist, which can improve the airway inflammation of asthma patients, with anti-inflammatory and asthma calming effects, mainly for asthma, but also can be used for allergic rhinitis. However, it should be noted that it should not be used during acute asthma attacks, and asthma patients should not stop using the drug suddenly, as it may aggravate the symptoms of asthma or make asthma relapse, and must stop the drug according to medical advice. In addition, this medication can be taken at bedtime to control asthma attacks at night or in the early morning. However, when treating allergic rhinitis, you can take the medication during rhinitis attacks according to your own situation. If you have both asthma and allergic rhinitis, you can take the medication every night.