​Cezlevo contains Levocetirizine. It is a third-generation non-sedative antihistamine which is the active enantiomer of cetirizine. Levocetirizine works by blocking histamine receptors. It is indicated in Seasonal allergic rhinitis, Perennial allergic rhinitis, Chronic idiopathic urticaria, Allergic conjunctivitis and in Anaphylactic reaction.