Xyzal, an antihistamine, is a prescription medication indicated for the symptoms of year round allergies, as well as a treatment for chronic hives and rashes of unknown cause (also known as chronic idiopathic urticaria) in patients 6 months of age and older, and symptoms of seasonal allergies in patients 2 years of age and older.
Levocetirizine (as levocetirizine dihydrochloride) is a third-generation non-sedative antihistamine, developed from the second-generation antihistamine cetirizine.
Chemically, levocetirizine is the active enantiomer of cetirizine.