Piriteze Allergy Tablets Piriteze Allergy Tablets contain the antihistamine cetirizine hydrochloride to treat the allergic symptoms (itchy or watery eyes, sneezing & a stuffy nose) of hayfever & other allergies, e.g. pet, house dust mite & mould spore allergies. They can also be used to relieve the rashes & itching of chronic urticaria (hives).