RESUMOGonçalves RF, Lauretti GR, Mattos AL -Estudo Comparativo entre Bupivacaína a 0,5% e Mistura Enantiomérica de Bupivacaína (S75-R25) a 0,5% em Anestesia Peridural Justificativa e Objetivos -A mistura enantiomérica de bupivacaína (S75-R25) Background and Objectives -A bupivacaine formulation containing 25% of R(+) and 75% of S(-) isomer has been used because its anesthetic properties with less toxicity than the racemic bupivacaine. This study aimed at evaluating the racemic bupivacaine as compared to B25/75 in epidural anesthesia. Methods -Participated in this study 44 patients who were distributed in two groups (n = 22), namely