“…A high-performance liquid chromatography (HPLC) with ultraviolet detection (UV) is the most widely used technique (Macek et al, 1999;Choi et al, 2000a, b;Kim et al, 2005;Zaater et al, 2000;Moncrieff, 1992;Jelinska et al, 2000Jelinska et al, , 2001Paw et al, 2002;Arayne et al, 2005;Bajerski et al, 2005;El Walily et al, 1998;Jaber et al, 2004;Nagaralli et al, 2003;Likar et al, 2005;Rosseel and Lefebvre, 1991) or liquid chromatography with spectrometric detection (LC-MS/MS) (Gergov et al, 2001;Gupta et al, 2005;de Jager et al, 2002;Rudaz et al, 2003;Song et al, 2005;Tan et al, 2006). Previously published methods included also gas chromatography (GC) (Baltes et al, 1988), high-performance thin-layer chromatography (HPTLC) (Makhija and Vavia, 2001;Pandya et al, 1996), electrooxidation (Güngör, 2004), spectrophotometric (El Walily et al, 1998;Mahgoub et al, 2003;Gowda et al, 2001;Basavaiah and Charan, 2002;Basavaiah et al, 1999;Gazy et al, 2002), titrimetric technique (Basavaiah and Charan, 2002) for cetirizine determination and assay based on cetirizine-tetraphenylborate ion-pair analysis (Shoukry et al, 1999). However, most of these procedures are time-consuming, not specific or selective enough.…”