A comparative study of the effect of Normal saline and butorphanol as adjuvant to intrathecal bupivacaine for postoperative analgesia in total abdominal hysterectomy. JOC [Internet]. 2025 Sep. 25 [cited 2026 Feb. 5];24(7s):432-6. Available from: https://carcinogenesis.com/index.php/JOC/article/view/1079