Other Information: Store at 68-77 degrees F (20-25 degrees C). Do not use if clamshell is opened, or if foil inner seal imprinted with Zyrtec is broken or missing. Misc: Cetirizine HCl antihistamine 10 mg tablets. Indoor & outdoor allergies. 24 hour relief of: sneezing; runny nose; itchy, watery eyes; itchy throat or nose. www.zyrtec.com. Active ingredient made in Belgium.