It is used to treat allergies and allergic reactions. It works in different ways to help alleviate symptom. It is a second-generation antihistamine, which means it blocks the action of histamine in the body. Histamine is a chemical released by the immune system in response to an allergen, such as pollen or dust mites. Histamine causes symptoms such as itching, sneezing, runny nose, and watery eyes. By blocking histamine, It can relieve these symptoms. It is also a leukotriene receptor antagonist. Leukotrienes are chemicals produced by the body in response to allergens. They cause inflammation and swelling in the airways, leading to symptoms such as coughing, wheezing, and shortness of breath. Montelukast blocks the action of leukotrienes, reducing inflammation and improving breathing.Combining bilastine and montelukast can provide more comprehensive relief of allergy symptoms than either medication alone. Bilastine can relieve symptoms such as itching, sneezing, and runny nose, while montelukast can improve breathing and reduce inflammation in the airways. Together, they can help alleviate the range of symptoms associated with allergies.It's important to note that you should only take these medications as directed by your healthcare provider. They can determine if these medications are appropriate for your individual needs and can monitor you for any potential side effects or drug interactions.