Montelukast is a drug that belongs to the category of Leukotriene receptor antagonist. It is a commonly prescribed drug for asthma, allergic rhinitis, and bronchospasms. It is a drug that is efficient in relieving symptoms of allergy, which include sneezing, runny nose, itchiness, etc. The primary mechanism of this drug is to block the agent that causes allergic symptoms, called Leukotrienes. Furthermore, it reduces the inflammation of the respiratory path and controls other allergic symptoms.