Dinalbuphine Ester (Naldebain) for Pain Management After Cesarean Section

SDE will be dissolved in benzyl benzoate and sesame oil (a total volume of 2ml) will be prepared in a 5-ml syringe 30 min before administration. Intramuscular injection into the gluteal muscles will be performed by an anesthesiologist under sonography-guidance

A single dose of morphine (0.15mg) will be administered along with bupivacaine during spinal anesthesia.