A novel, specific, precise, simple, and accurate RP-HPLC method is developed and validated for simultaneous determination of Cefixime trihydrate (CFX) and Sodium benzoate (SDM) in powder for oral suspension (POS) dosage form. RP-HPLC method is performed on the Agilent Eclipse XDB C8 column (250 mm X 4.6 mm, 5μm particle size, using buffer solution of pH 2.8 containing 0.02M sodium dihydrogen phosphate: Acetonitrile (50:50 v/v) as the mobile phase at a flow rate of 1.0 mL/min, injection volume 10 µL and UV detection at 229 nm. And the total run time was 7.0 min. Linear relationships are obtained in the ranges of 5-200 µg/mL and 2-40 µg/mL for CFX and SDM, respectively, with significantly different R t values of 2.203 and 3.970 min for CFX and SDM with correlation coefficients (r) >0.9999, limits of detection of 1.36 and 0.21 µgmL -1 and limits of quantitation was 4.14 and 0.64 µgmL -1 for CFX and SDM, respectively. The obtained results for the suggested method were statistically compared with those obtained by official or the reported method for CFX and SDM, respectively using student's-t and F-ratio tests, showing that the methods are accurate and precise. This method is validated according to ICH guidelines and USP requirements for new methods, which include accuracy, precision, specificity, LOD, LOQ, robustness, ruggedness, linearity and range. Hence this RP-HPLC method is suitable for quality control of raw materials and finished products. The accurate determination of low levels of both drugs is very important for the analysis of forensic problems.

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Materials and reagents Pure samples: Standard sample of AMO is kindly supplied by Hikma pharmaceutical industries company, Beni-Suef, Egypt with claimed purity of 98.2%.