A Novel Simultaneous Estimation of Metformin, Glimepiride and Rosiglitazone in Tablet Dosage Form by RP-HPLC Method

A rapid RP-HPLC method was developed and validated for simultaneous estimation of metformin, glimepiride and rosiglitazone from pharmaceutical dosage forms. A sensitive chromatographic separation was accomplished on XTerra C₁₈ (100×4.6 mm, 5μ) with mobile phase consisting of Methanol: phosphate buffer (p^H4.0 adjusted with ortho phosphoric acid) in the ratio of 75:25 v/v, at a flow rate of 1.0 ml/min and eluents monitored at 239 nm. The developed method was validated in terms of accuracy, precision, linearity and limit of detection, limit of quantification, robustness and solution stability. The proposed method can be used for the estimation of these drugs in combined pharmaceutical dosage forms.