Description Zyrtec Oral Solution 1mg/ml contains Cetirizine. Cetirizine is an antihistamine that relieves allergy symptoms. It works by blocking a specific natural substance (histamine) that your body makes during an allergic reaction. Cetirizine is an antihistamine used to relieve allergy symptoms such as watery eyes, runny nose, itching eyes/nose, sneezing, hives, and itching. It works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction.
