Montek BL Tablet is a medicine used to treat allergies and breathing problems. It contains Montelukast, which blocks substances called leukotrienes that cause airway swelling and asthma symptoms, and Bilastine, an antihistamine that reduces sneezing, runny nose, watery eyes, and itching. Together, they help relieve symptoms of allergic rhinitis (seasonal or year-round allergies) and also support people with asthma linked to allergies by improving breathing and controlling inflammation.