Showed that the addition of a small dose of nalbuphine or fentanyl to bupivacaine in spinal anesthesia moderately prolonged the time of postoperative analgesia, While the duration of analgesia was more prolonged and the adverse effects were minimal with the group of nalbuphine, our result shows no significant difference , but shows significant difference in the onset of motor block as more rapid with the group of fentanyl The use of opioids in intrathecal or epidural anesthesia has become popular to optimize postoperative analgesia. However, opioid-induced side effects, such as respiratory depression, nausea, vomiting, urinary retention and pruritus, limit their use.