IRCT20191001044941N1 IRCT 2019-12-25 Ahvaz University of Medical Sciences Comparison of divided doses with bolus injection of bupivacaine in spinal anesthesia Comparison of dose divided by bolus injection of bupivacaine in spinal anesthesia in patients undergoing cesarean section 2019-10-23 anticipated 60 Complete https://irct.ir/trial/42738 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: According to the random number table, they will be divided into two groups of 30 people, Blinding description: The principal investigator (supervisor) performs spinal anesthesia and is in the process of blinding, but the patient and physician sampled and the recovery nurse assessing the block and pain are not aware of the type and mode of spinal anesthesia. N/A pain. Intervention 1: Intervention group: bupivacaine, 0.5%, 12 mg, in divided doses ,for 1/3 full dose is administered initially and after 60 seconds the remaining 2/3 is injected. Intervention 2: Control group: Administration of bupivacaine 12 mg as a bolus. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is I have no plans for now