IRCT2015052722449N1 IRCT 2015-11-02 Vice Chancellor for Research, Hormozgan University of Medical Sciences Comparison of the effect of Fentanyl with Dexmedetomidine on post operative pain of cesarean section Comparison of the effect of intrathecal Bupivacaine and Fentanyl with Bupivacaine and Dexmedetomidine on post operative pain of cesarean section in Shariati Hospital of Bandar Abbas in 2014 2014-03-21 anticipated 110 Complete https://irct.ir/trial/19350 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Other design features: Randomized with two-block design is considered. Double blinding design will be provided by concealing the awareness of the patients and the researcher who is in charge of data collection from the type of intervention. 3 Complication of Anesthesia during pregnancy. Intervention 1: Group 2: Intrathecal 10 mg bupivacaine 0.5% plus 25 microgram fentanyl. Intervention 2: Group 1: Intrathecal 10 mg bupivacaine 0.5% plus 5 microgram dexmedetomidin.