two sensitive spectrophotometric methods are presented for the assay of pantoprazole sodium sesqui hydrate (pnt) in bulk drug and in formulations using n-bromosuccinimide (nbs) and two dyes, methyl orange and indigo carmine, as reagents. the methods involve the addition of a known excess of nbs to pnt  in acid medium, followed by determination of unreacted oxidant by reacting with a fixed amoun...