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1-(4-Chlorobenzhydryl)piperazine is an inactive metabolite of meclizine and chlorcyclizine .1,2 It has also been found as an impurity in commercial preparations of hydroxyzine and cetirizine .3,4 1-(4-Chlorobenzhydryl)piperazine has been used in the synthesis of voltage-gated sodium channel 1.7 (Nav1.7) inhibitors, anticancer agents, and antihistamines.5,6,7

1.Gaertner, H.J., Breyer, U., and Liomin, G.Chronic administration of chlorcyclizine and meclizine to rats: Accumulation of a metabolite formed by piperazine ring cleavageJ. Pharmacol. Exp. Ther.185(2)195-201(1973) 2.Kuntzman, R., Klutch, A., Tsai, I., et al.Physiological distribution and metabolic inactivation of chlorcyclizine and cyclizineJ. Pharmacol. Exp. Ther.149(1)29-35(1965) 3.Simpson, D., Skellern, G.G., and Miller, J.H.Method for the control of known impurities in hydroxyzine hydrochlorideJ. Pharm. Biomed. Anal.14(8-10)1371-1375(1996) 4.Javid, F.S., Shafaat, A., and Zarghi, A.Determination of cetirizine and its impurities in bulk and tablet

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