Cetirizine ( /sɛˈtɪrɨziːn/), a second-generation antihistamine, is a major metabolite of hydroxyzine, and a racemic selective H1 receptor inverse agonist used in the treatment of allergies, hay fever, angioedema, and urticaria.
Read more about Cetirizine: Availability, Pharmacology, Administration Method and Metabolism, Side Effects, Synthesis