Manoj Kumar Jadia1*, U.L.Narayan2
1 Department of Pharmaceutical Chemistry, Indira Gandhi Institute of Pharmaceautical Sciences, I.R.C. Village, Bhubaneswar, Dist:Khurda, Odhisa -751015
2 Principal, Department of Pharmaceutical Chemistry, Indira Gandhi Institute of Pharmaceautical Sciences, I.R.C. Village,
Dist:Khurda, Odhisa -751015
Two methods are described for the simultaneous determination of Paracetamol and Chlorzoxazone in binary mixture. The first method was based on UV-spectrophotometric determination of two drugs, using simultaneous equation method. It involves absorbance measurement at 282.5 nm (λmax of Chlorzoxazone) and 248.0 nm (λmax of Paracetamol) in methanol; linearity was obtained in the range of 5 – 25 μg.mL-1 for both the drugs. The second method was based on HPLC separation of the two drugs in reverse phase mode using Promosil C18 column. Linearity was obtained in the concentration range of 100-500 μg.mL-1 for Paracetamol and 50-250 for the Chlorzoxazone. Both these methods have been successively applied to pharmaceutical formulation and were validated according to ICH guidelines.