Lejet M 5 mg/10 mg Tablet is a combination medication containing Levocetirizine 5 mg and Montelukast 10 mg, indicated for the management of allergic conditions such as allergic rhinitis and chronic urticaria. Levocetirizine, a third-generation non-sedating antihistamine, selectively inhibits peripheral H1 receptors, thereby reducing symptoms like sneezing, nasal congestion, itching, and rhinorrhea associated with allergic responses. Montelukast, a leukotriene receptor antagonist, blocks leukotriene D4 at the cysteinyl leukotriene receptor in the airway, leading to decreased bronchoconstriction, inflammation, and mucus production. The synergistic action of these agents provides comprehensive relief from both nasal and respiratory allergic symptoms. Lejet M is typically administered once daily, with or without food, as prescribed by a healthcare professional. It is generally well tolerated; however, patients should be monitored for potential side effects including headache, fatigue, gastrointestinal disturbances, or neuropsychiatric events. Caution is advised in individuals with hepatic or renal impairment, and the medication should be used under medical supervision in pediatric and elderly populations. Lejet M offers an effective therapeutic option for patients requiring dual-action treatment targeting histamine and leukotriene pathways in allergic disease management.