Deschloro Cetirizine Dihydrochloride is a deschlorinated analog and metabolite of the antihistamine Cetirizine. It is primarily used as a reference standard in pharmaceutical analysis for the detection and quantification of impurities or degradation products in Cetirizine formulations. Additionally, it serves in research applications to study the metabolism, pharmacokinetics, and structure-activity relationships of second-generation antihistamines, aiding in drug development and quality control processes.