IRCT20100713004365N23 IRCT 2018-09-22 Mazandaran University of Medical Sciences Effect of adding lidocaine to morphine for pain control after cesarean section Effect of adding lidocaine to Patient Controlled Analgesia (PCA) with morphine on pain intensity after cesarean section with spinal anesthesia 2018-10-17 anticipated 80 Complete https://irct.ir/trial/33890 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Before the start of the study, the list of subjects for 2 groups of the study will be determined randomly, using a computer-generated random list for 80 patients. Based on this list, envelopes in which the name of one of the treatment groups is written are prepared. These envelopes are placed in the operating room, and if patients meet the inclusion criteria, an envelope will be opened for each patient and their treatment group will be identified accordingly. This work will be done by an anesthetist technician, Blinding description: This study will be double-blind, and the data analyser, collaborative nurses who will asses the outcomes of the study and patients are unaware of the patients' treatment groups. 3 Cesarean section. Intervention 1: Intervention group: For patients in the intervention group, the PCA solution contain 50 ml of 2% lidocaine with 30 mg (3 ml) of morphine in 47 mL of normal saline (total volume 100 ml) which will be infused during the 24 hours. The PCA will be set to administer a bolus dose of 0.5 mL with a lockout interval of 15 minutes and a background infusion rate of 2 mL/h. Intervention 2: Control group: In the control group, the PCA solution contain 30 mg of morphine (3 ml) in 97 ml of normal saline which will be infused during the 24 hours. The PCA will be set to administer a bolus dose of 0.5 mL with a lockout interval of 15 minutes and a background infusion rate of 2 mL/h. 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 There is no further information