Cetirizine (US Brand Name: Zyrtec)

Cetirizine Cetirizine tablets What do cetirizine tablets do?CETIRIZINE (Zyrtec(R)) is an antihistamine. Antihistamines work by preventing the effects of a substance called histamine, which is produced by the body. Cetirizine is used to relieve or prevent the symptoms of hay fever and other types of allergy. It is also used to help relieve itching and hives. What should my health care professional know before I take cetirizine?They need to know if you have any of these conditions: