Xyzal is a prescription antihistamine medication containing 5 mg of levocetirizine dihydrochloride per tablet. This package contains 30 film-coated tablets and is manufactured by GSK for treating allergy symptoms. The active ingredient in Xyzal is levocetirizine dihydrochloride 5 mg. The tablets are film-coated for easy swallowing. As this is a prescription medication, it should only be taken under the direction and supervision of a healthcare provider. The medication is used to relieve allergy symptoms such as sneezing, runny nose, and itchy eyes.