IRCT20190529043751N1 IRCT 2019-07-08 Ahvaz University of Medical Sciences Comparing the effects of bupivacaine and ropivacaine in the casarean section. Comparing the effects of bupivacaine and ropivacaine on the patients undergoing cesarean section in spinal anesthesia 2019-04-04 anticipated 60 Complete https://irct.ir/trial/39901 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: By random block permutation, individuals will be randomly divided into two groups. The block sizes can be 4, 6 and so on. 6 blocks including 4 characters will be considered; AABB, ABAB, BBAA, BABA, ABBA, and BAAB. We will sample from the six blocks, with replacement to the extent that the sample size is completed. In this case, a sequence of letters will be obtained, in which individuals will be randomly divided into two equal groups, Blinding description: All medications will be in similar and dark pockets. A numeric label will be on each pack of medications. Patient and researcher will not inform of the number assigned to the relevant group. Then, according to the random sequence based on random block permutation, the packets of medications will be given to the researcher. 2 cesarean. Intervention 1: Ropivacaine group: Ropivacaine 1%( 15mg) ) (manufactured by Dei Fratelli Societa Di Eserciozio SpA C & Molteni L, Italy) will be injected during surgery. Intervention 2: Bupivacaine group: Hyperbaric bupivacaine 0.5% (10 mg)(manufactured by AstraZeneca, Sweden) will be injected during surgery. No - There is not a plan to make this available Justification or reason for not sharing IPD is To keep patients' information confidential