Xyzal is an antihistamine medication containing 5mg of levocetirizine dihydrochloride per tablet. Manufactured by GSK, this prescription medication comes in a pack of 30 tablets and is used to treat allergy symptoms like sneezing, runny nose, and itchy eyes/skin. Levocetirizine belongs to a class of drugs called antihistamines that work by blocking histamine, a natural substance your body makes during an allergic reaction. The medication typically starts working within one hour and provides 24-hour relief from allergy symptoms. The tablets should be taken once daily with or without food, preferably in the evening. Store at room temperature away from moisture and heat. This medication requires a prescription and should be taken under medical supervision.