IRCT20170220032676N3 IRCT 2020-11-18 Mazandaran University of Medical Sciences Effect of preoperative oral elatonin on pain intensity Effect of preoperative oral Melatonin on pain intensity after cesarean section 2020-12-04 anticipated 240 Complete https://irct.ir/trial/52231 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: The randomization process is done with Random Allocation Soft ware.The block size is six and the number of blocks is 34. The randomization is done using block method. Unit of randomization is individual. Randomization is done using a table of random numbers and to generate random sequences as online, computer is used. For concealing treatment allocation, the list of treatments are placed in the enclosed and numbered (to maintain order of sequences) envelopes, Blinding description: Patients and researchers will be unaware of group placement, and drugs will be coded at the School of Pharmacy at the time of manufacture. N/A Cesarean. Intervention 1: Intervention group: Group A received 5 mg Melatonin tablets (Made by Nature Made, USA). Intervention 2: Intervention group: Group B received 10 mg Melatonin tablets (Made by Nature Made, USA). Intervention 3: Control group: Melatonin orally, 1 hour before surgery. 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 Due to the confidentiality of patients' information