“…Rabeprazole (RAB) , 2-[[4-(3-Methoxypropoxy)-3-methylpyridin-2-yl] methyl sulfinyl]1H-benzimidazole used in peptic ulcer disease, excess stomach acid production and gastro esophageal reflux disease where, its pharmacological effect is similar to other proton pump inhibitors (PPIs) [15] . Spectrophotometric [16] , [17] , flourimetric [18] , HPTLC [19] , [20] and HPLC [21] , [22] methods were successfully applied for RAB's estimation. The chemical structures for the three drugs; ACE , PAR and RAB are shown in Fig.…”