Aims:

To develop and validate an analytical method for the simultaneous analysis of atorvastatin (ATO), losartan (LOS), and metformin (MTF) in pharmaceutical compounding by HPLC.

Method:

The method was developed using a liquid chromatograph model Dionex® Ultimate 3000, coupled to a diode array detector (DAD), and validation was carried out according to international and national validation compendiums. The following parameters were analyzed: linearity, precision, accuracy, robustness, selectivity, LD, and LQ. Chromatographic separation was performed on a Sigma-Aldrich® C18 column, mobile phase MeOH:H2O (78:22 v/v), pH 3.0, and flow rate of 0.3 mL-min-1, isocratic mode. Detections were performed at 225 nm (LOS), 236 nm (MTF), and 246 nm (ATO) wavelengths.

Results:

The method was linear, with linear correlation coefficients (r)> 0.99 for all drugs, precise (DPR between measurements < 2 %), accurate recovery (between 98-102 %). The variations proposed in the robustness study had no significant influence on the results, except for the chromatographic column. The method was selective, as the excipients did not interfere in the analyses. The sensitivity of the method was demonstrated through the theoretical determination of LD and LQ.

Conclusion:

The results obtained suggest that the chromatographic method developed and validated in this research can be used in the routine analyzes of quality control laboratories of drugs containing these drugs alone or combined in pharmaceutical formulations for oral use.