Hhlevo 5mg Tablet contains Levocetirizine 5mg, a potent second-generation antihistamine used primarily for the treatment of allergic conditions. Levocetirizine selectively antagonizes peripheral H1 histamine receptors, thereby inhibiting the effects of histamine, a key mediator involved in allergic responses. This action helps alleviate symptoms such as sneezing, nasal congestion, rhinorrhea, and itchy or watery eyes associated with allergic rhinitis, as well as pruritus and urticaria in chronic idiopathic urticaria. Hhlevo 5mg is indicated for adults and children over six years of age and is favored for its minimal sedative effects compared to first-generation antihistamines, owing to its limited penetration of the blood-brain barrier. The tablet is administered orally, typically once daily, with or without food, providing sustained relief over 24 hours. It is important to adhere to prescribed dosages to avoid potential adverse effects such as headache, dry mouth, and fatigue. Caution is advised in patients with renal impairment, and dosage adjustments may be necessary. Hhlevo 5mg should be used under medical supervision, particularly in pregnant or lactating women, and in individuals with hypersensitivity to levocetirizine or related compounds.