Two simple and high sensitive spectrophotometric methods have been developed for the quantitative determination of clopidogrel bisulfate (CLPB), in pure form and in pharmaceutical formulations, through H-point standard addition method (HPSAM) which showed suitable abilities to resolve accurately overlapped absorption spectra of the compounds by simultaneous determination of CLPB in its binary mixture with aspirin (ASP), and the other method is ion-pair formation reactions with some sulphonphthalein, e.g. bromophenol blue (BPB), bromocresol purple (BCP), bromocresol green (BCG), and...