Zyrtec is an antihistamine medication containing 10mg of cetirizine dihydrochloride per tablet. Each pack contains 20 film-coated tablets manufactured by GSK, used to provide relief from allergy symptoms like hay fever, sneezing, runny nose and itchy eyes. The film-coated tablets provide a convenient oral dosage form for adults and children (as directed by healthcare provider). Cetirizine dihydrochloride works by blocking histamine receptors, helping to reduce allergy symptoms. As this is a medication, proper dosage and usage instructions should be followed according to the package insert or healthcare provider's recommendations.