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Contents of the five vials labeled to contain 250 mg of the ceftriaxone sodium were weighed and mass of powdered commercial formulation per vial was calculated. Similarly the average weight of powder of commercial formulation per capsule of cefaclor was also calculated. Mass of powdered commercial formulations claimed to contain 0.00625 g of ceftriaxone was dissolved in water and diluted to 25 mL with distilled water to get stock solution (250 μgmL-1). Similarly, 250 μgmL-1 stock solution of cefaclor commercial formulation was prepared by dissolving mass of powdered commercial formulations claimed to contain 0.00625 g of cefaclor in distilled water on gentle heating and diluting to 25 mL with distilled water. Artificial mixture of the commercial formulations (1:1) in the concentration range of 0.5 μgmL-1, 2.5 μgmL-1 and 5.0 μgmL-1 were prepared by mixing appropriate volumes of stock solutions of the commercial formulations and diluting to appropriate volume with the mobile phase. All sample solutions were filtered through 0.45 um membrane filter before injection to the chromatographic system.