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Addition of magnesium sulfate to local anesthetics improves the quality of spinal anesthesia for caesarean section. The aim of this study was to compare the effects of intrathecal 0.5% hyperbaric bupivacaine with 75-mg magnesium sulfate (MgSO) and 0.5% isobaric levobupivacaine with 75-mg MgSO on the duration of analgesia in parturients undergoing elective caesarean section.