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Cetirizine is an antihistamine medicine, most commonly found in hay fever and allergy tablets to help relieve symptoms of sneezing, coughing, runny or blocked noses as well as watery and itchy eyes. Cetirizine is also known as a non-drowsy antihistamine and it is much less likely to make you feel sleepy than some other antihistamines. Cetirizine is available on prescription as well as being bought over the counter from pharmacies and supermarkets.