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Levocetirizine is a second-generation antihistamine medication used to relieve symptoms associated with allergic rhinitis, such as sneezing, itching, runny nose, and nasal congestion. It belongs to the class of drugs known as selective histamine H1 receptor antagonists, which work by blocking the action of histamine, a substance released by the body during an allergic reaction. Levocetirizine is the active enantiomer of cetirizine, offering similar efficacy with potentially fewer side effects.

One of the key benefits of levocetirizine is its rapid onset of action and long duration of effect, providing quick relief from allergy symptoms with once-daily dosing. Its non-sedating properties make it suitable for daytime use, allowing individuals to function normally without experiencing drowsiness or impairment. Levocetirizine is also well-tolerated with a low incidence of adverse reactions, making it a preferred choice for the management of allergic rhinitis in both adults and children.