Levosiz 10 Tablet contains Levocetirizine 10 mg, a potent third-generation antihistamine used primarily for the treatment of allergic conditions. Levocetirizine is the active enantiomer of cetirizine and functions as a selective antagonist of peripheral H1 histamine receptors, effectively reducing symptoms associated with allergic rhinitis, chronic idiopathic urticaria, and other histamine-mediated allergic disorders. By inhibiting the action of histamine, Levosiz 10 alleviates symptoms such as sneezing, nasal congestion, rhinorrhea, itching, and hives. The medication is characterized by its rapid onset of action and prolonged duration, providing sustained relief with minimal sedation compared to first-generation antihistamines. Levosiz 10 is typically administered orally once daily, with dosage adjustments recommended in patients with renal impairment. It is well tolerated, with adverse effects including mild headache, dry mouth, and fatigue in some cases. Contraindications include hypersensitivity to levocetirizine or any component of the formulation. Caution is advised when used concomitantly with CNS depressants or alcohol. Levosiz 10 Tablet is an effective and reliable option for managing allergic symptoms, improving patient quality of life through targeted histamine receptor antagonism.