2.6. Method development
Most of reported methods were for determination of PCM andPAM alone without taking into consideration their potential impu-rities and due to the nephrotoxic effect of PAP and the differentpharmacological action of THEO from the parent drug PAM. Hence,it was necessary to develop and validate simple, sensitive and selec-tive HPTLC and RP-HPLC methods for simultaneous determinationof PCM, PAM in presence of their potential impurities in bulk mate-rial and in their pharmaceutical formulation