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Reducing treatment complexity can be achieved through the use of single-tablet triple fixed-dose combinations of oral hypoglycemic agents. A simple, precise and accurate reverse-phase high-performance liquid chromatographic (RP-HPLC) method was developed and validated for the simultaneous determination of Metformin (MET), Voglibose (VOG) and Pioglitazone (PIO) in pharmaceutical dosage forms. Chromatographic separation was achieved on an Younglin (SK) gradient System with UV 730 D detector and Cosmosil C18 (250 x 4.6 mm, 5μm) column, maintained at 45°C using 0.1% v/v acetonitrile: triethylamine (30:70, v/v), pH 2.5 with flow rate 0.8 ml/min with injection volume at 20 μl and wavelength ultraviolet detection at 232 nm. MET, PIO and VOG obey Beer–Lambert’s law over the concentration range of 200-600 μg/ml, 30-90 μg/ml and 0.08-0.24 μg/ml, respectively, with regression equations y=2.021x -186.7 (MET) (R2 = 0.998), y=9.876x-202.31 (PIO) (R2 = 0.999), and y= 502.3x-17.23 (VOG) (R2 = 0.999). % RSD and recoveries were 100.57-101.60 for MET, 99.79-102.61 for PIO and 100.02-101.05 for VOG indicate good accuracy of method. The marketed formulation analyzed using developed method and mean % amount were found 101.62, 100.38 and 98.75 for MET, PIO and VOG respectively with % RSD values NMT 2.0%. The developed spectrophotometric method can be employed for routine analysis of MET, VOG and PIO in bulk and tablet formulation. The developed RP-HPLC method was sensitive and selective for estimation of metformin, voglibose and pioglitazone in combined dosage form. The method was validated as per ICH guidelines.

journal of drug delivery and therapeutics

Novel RP-HPLC method development and validation for simultaneous estimation of metformin, voglibose and pioglitazone in bulk and triple fixed drug combinations pharmaceutical dosage form