Development and validation of a HPLC/PDA method for simultaneous quantification of amlodipine besylate and valsartan in dissolution media

Investigation of the mobile phase for separating amlodipine and valsartan using the isocratic elution method and validation of the simultaneous quantification of amlodipine and valsartan in three different dissolution media with pH of 1.2, 4.5, and 6.8.