They determined the parameters for the revalidation of the analytical method spectrophometric to 310 nm (TPT126 review 05), proposed by the Institute laboratory Quimioterápico SA (IQFARMA) for the quantification of Mebendazole tablets. We performed an analysis of Mebendazole 100 mg tablets lot 00101007. Formic acid and alcohol isopropílico were used like solvents. Getting in the trial of Linearity a correlation coefficient of 0.9999; Test Statistical Linearity and Response Factor, expressed conformity. For accuracy, the percentage of recovery was 100,885. In the Test G Cochran was obtained G Exp. Tables G minor (0.4993 <0.8709). For statistical Student's t test was obtained t Exp. Less than t Table (2,169 <2,306), the accuracy is correct according to their respective specifications. In assessing accuracy, repeatability of the test showed a concentration averaged 101,344 mg per tablet w...