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Zyrtec Allergy Relief (10 mg), 45-Count Tablets ZYRTEC (cetirizine HCl) is a prescription medicine that treats both indoor and outdoor allergy symptoms. And it also treats itching due to chronic hives. Studies show that 1 dose of ZYRTEC works for a full 24 hours. ZYRTEC is also great for the whole family. ZYRTEC is approved [...]