Histaban 5mg Tablet contains Levocetirizine 5mg, a third-generation non-sedative antihistamine used primarily for the relief of allergic symptoms. Levocetirizine is the active enantiomer of cetirizine and acts as a selective antagonist of peripheral H1 histamine receptors, thereby inhibiting the effects of histamine released during allergic reactions. Histaban is indicated for the treatment of allergic rhinitis, including seasonal and perennial allergic rhinitis, as well as chronic idiopathic urticaria characterized by symptoms such as sneezing, nasal congestion, runny nose, itching, and hives. The medication offers rapid onset of action and sustained relief of symptoms with minimal sedation due to its low penetration of the blood-brain barrier. It is administered orally, typically once daily, with or without food, and dosage adjustments may be necessary in patients with renal impairment. Histaban is generally well tolerated; common adverse effects include headache, dry mouth, and fatigue, while serious side effects are rare. It is contraindicated in patients with known hypersensitivity to Levocetirizine or cetirizine and should be used cautiously in special populations such as pregnant or lactating women. Overall, Histaban 5mg Tablet provides effective and safe management of allergic conditions by targeting histamine-mediated symptoms.