Instalast Oral Suspension Mango is a combination medication containing Levocetirizine (2.5 mg/5 ml) and Montelukast (4 mg/5 ml), formulated for the management of allergic conditions. Levocetirizine is a third-generation non-sedating antihistamine that selectively inhibits peripheral H1 receptors, effectively reducing symptoms such as sneezing, rhinorrhea, nasal congestion, and pruritus associated with allergic rhinitis and chronic urticaria. Montelukast is a leukotriene receptor antagonist that blocks cysteinyl leukotriene receptors, thereby decreasing inflammation, bronchoconstriction, and mucus production commonly observed in asthma and allergic rhinitis. The synergistic action of these agents provides comprehensive relief from allergic symptoms by targeting multiple inflammatory pathways. Instalast Oral Suspension is particularly suitable for pediatric patients due to its palatable mango flavor and precise dosing. It is indicated for the treatment of seasonal and perennial allergic rhinitis, chronic idiopathic urticaria, and as an adjunct therapy in mild to moderate asthma. The suspension should be administered as directed by a healthcare professional, with dosage adjustments based on age and clinical response. Common side effects may include headache, somnolence, abdominal pain, and gastrointestinal disturbances. Patients with hepatic or renal impairment should use this medication cautiously under medical supervision.