The aim of this study was to evaluate the effectiveness of gabapentin in reducing pain after cesarean section in order to reduce the use of narcotic drugs, which is randomized, double blind, post-marketing, single-center, stage two trials. In this study, participants are randomly categorized in separate groups, thus allowing comparison of interventions to the researcher. Patients under study, women referring to health center, educational, research martyrs Mobini Sabzevar, who intends to have elective cesarean section. The main in inclusion criteria are: Pregnant women with term pregnancy؛ spinal anesthesia؛ aged over eighteen years old؛ with pfannenstiel incision case in previous cesarean section؛ live and single fetus. The main exclusion criteria included: need general anesthesia؛ analgesic use 8 hours before surgery؛ use non-steroidal anti-inflammatory drugs 24 hours before surgery, and the patients are divided into two groups of 51, comprising the control group (1 placebo capsule) and the intervention group (1 capsule gabapentin 300 mg). Both groups receive oral medication, then cesarean section. The main study is pain.