Development, Validation and Application of RP-HPLC Method:Simultaneous Determination of Antihistamine and Preservatives withParacetamol in Liquid Formulations and Human Serum

Abstract: In this article we describe development and validation of stability indicating, accurate, specific, precise and simple Ion-pairing RP-HPLC method for simultaneous determination of paracetamol and cetirizine HCl along with preservatives i.e.propylparaben, and methylparaben in pharmaceutical dosage forms of oral solution and in serum. Acetonitrile: Buffer: Sulfuric Acid(45:55:0.3 v/v/v) was the mobile phase at flow rate 1.0 mL min-1 using a Hibar® Lichrosorb® C18 column and monitored at wavelengthof 230nm. The averages of absolute and relative recoveries were found to be 99.3%, 99.5%, 99.8% and 98.7% with correlationcoefficient of 0.9977, 0.9998, 0.9984, and 0.9997 for cetirizine HCl, paracetamol, methylparaben and Propylparaben respectively.The limit of quantification and limit of detection were in range of 0.3 to 2.7 ng mL-1 and 0.1 to 0.8 ng mL-1 respectively. Under stressconditions of acidic, basic, oxidative, and thermal degradation, maximum degradation was observed in basic and oxidative stresswhere a significant impact was observed while all drugs were found almost stable in the other conditions. The developed method wasvalidated in accordance with ICH and AOAC guidelines. The proposed method was successfully applied to quantify amount ofparacetamol, cetirizine HCl and two most common microbial preservatives in bulk, dosage form and physiological fluid.