Piriteze Antihistamine Allergy Relief Tablets Cetrizine 14 per packPiriteze Allergy Tablets offer up to 24 hour allergy relief for adults and children 6+ years. The active ingredient is cetirizine hydrochloride, an antihistamine that can help to relieve the symptoms of some allergies and itchy skin rashes. Antihistamine tablets from Piri, the UK's No. 1 selling allergy brand. Allergy Relief Tablets treats symptoms of hay fever and allergies such as pets, house dust mites, mould spore allergies and skin allergies such