Evonast-LC Tablet is a combination medication containing Levocetirizine 5mg and Montelukast 10mg, formulated to provide effective relief from allergic conditions such as allergic rhinitis and chronic urticaria. Levocetirizine, a third-generation antihistamine, works by selectively blocking peripheral H1 receptors, thereby reducing symptoms like sneezing, runny nose, itching, and watery eyes. Montelukast, a leukotriene receptor antagonist, inhibits the action of leukotrienes, which are inflammatory chemicals responsible for bronchoconstriction, mucus production, and airway inflammation, making it particularly useful in managing asthma and allergic rhinitis. The combination of these two agents offers a synergistic effect, addressing both immediate histamine-mediated allergic reactions and the prolonged inflammatory response. Evonast-LC is typically prescribed for patients who require comprehensive management of allergic symptoms, improving overall respiratory function and quality of life. It is generally well-tolerated, with minimal side effects such as headache, fatigue, or gastrointestinal discomfort. However, it should be used under medical supervision, especially in patients with liver or kidney impairment. This tablet is taken orally, usually once daily in the evening, to maximize efficacy and patient compliance.