Cetirizine: antihistamine that relieves allergy symptoms - NHS

cetirizine 20 mg  Cetirizine is known as a non-drowsy antihistamine. It's much less likely to make you feel sleepy than some other antihistamines. Cetirizine is available on prescription, but you can also buy it from pharmacies and supermarkets. It comes as tablets, capsules and as a liquid that you swallow. 2.