L-Zcet-5 contains Levocetirizine Hydrochloride, a non-sedating antihistamine used for the relief of ...L-Zcet-5 contains Levocetirizine Hydrochloride, a non-sedating antihistamine used for the relief of allergy symptoms such as sneezing, runny nose, itchy/watery eyes, and skin reactions. It works by blocking histamine, the substance responsible for allergic symptoms. See more