Lazine M Tablet is a combination medication containing Levocetirizine 5mg and Montelukast 10mg, formulated for the management of allergic conditions such as allergic rhinitis and chronic urticaria. Levocetirizine is a potent, selective antagonist of peripheral histamine H1-receptors, providing rapid relief from symptoms including sneezing, nasal congestion, runny nose, and itching by inhibiting the action of histamine, a key mediator in allergic reactions. Montelukast, a leukotriene receptor antagonist, complements this effect by blocking leukotriene D4 at the cysteinyl leukotriene receptor, thereby reducing inflammation, bronchoconstriction, and mucus production associated with allergic airway diseases. The combination therapy offers a dual mechanism of action, targeting both histaminergic and leukotriene pathways, which enhances symptomatic control and improves patient compliance by reducing the pill burden. Lazine M is indicated for the treatment of seasonal and perennial allergic rhinitis, as well as for the prophylaxis and chronic treatment of asthma in patients who require additional control beyond standard antihistamines. The medication should be used under medical supervision, with caution advised in patients with hepatic or renal impairment. Common adverse effects may include headache, somnolence, and gastrointestinal disturbances.