The aim of this study is to compare the effect of intravenous acetaminophen with combination of suppository diclofenac and incisional bupivacaine on post cesarean section pain control. This will be an interventional, double-blinded, single center, controlled with placebo and randomized study on 100 pregnant women candidates of elective cesarean section, 18 to 45 years of age. Emergency cases, individuals with history of opioid addiction, severe cardiac, renal and hepatic disorders, gastro-esophageal reflux disease and convulsion will be excluded. Patients will randomly allocated to either intravenous acetaminophen (A) or combination of incisional bupivacaine and diclofenac (B) group. The patients of both groups will undergo general anesthesia in a similar manner. On arrival to recovery room group A patients will receive 20 mg/kg intravenous acetaminophen in 100 ml normal saline and the patients in group B just the same volume of normal saline. Group B patients will receive a diclofenac suppository (50 mg) before surgery and another two doses within 8 hr intervals and in group A the patients will take placebo suppositories at the same intervals. At the end of the procedure the patients in B group will have 1.5 mg/kg intraincisional injections of 0.25% bupivacaine and the other group 0.6 ml/kg (same volume) of normal saline injection. All the placebo compounds will be prepared with similar appearances to their drug counterparts and neither patients nor prescribers or data assessing personels will be aware of their true nature. Postoperative pain will be treated by intravenous morphine injections. Pain as the primary outcome will be assessed by NRS at 6, 12, 18 and 24 hours after surgery. Secondary outcomes include: assessment of the time of first request for analgesic, 24 hr morphine consumption, patient's sleep, sedation score (by Wilson criteria), drug side effects (nausea and vomiting and pruritus), pain intensity during ambulation and global satisfaction of the patients.