Cetirizine Impurity C is an impurity of Cetirizine. Cetirizine is a second-generation antihistamine and the carboxylated metabolite of hydroxyzine. It acts as a specific, orally active, and long-acting antagonist of the histamine H1-receptor[1][2].

Cetirizine Impurity C dihydrochloride, a specific impurity of Cetirizine, is associated with a second-generation antihistamine that serves as the carboxylated metabolite of hydroxyzine. This compound acts as a specific, orally active, and long-acting antagonist of the histamine H1-receptor [1] [2].