Introduction: One of the primary aims of anesthesia is to relieve the patient's pain and agony, thereby the surgical procedures can be conducted without any discomfort. Relief of intraoperative and postoperative pain has gained importance in recent years, considering the central, peripheral and immunological stress response to tissue injury. Any expertise acquired in this field should be extended into the postoperative period, which is the period of severe, intolerable pain requiring attention. So there is need of extended analgesia without any side effects in the process of achieving this goal. “Regional anaesthesia” is the term first used by Harvey Cushing in 1901 to describe pain relief by nerve block 1 . Regional nerve blocks are based on the concept that pain stimulus conveyed by nerve fibers, which are amenable to interruption anywhere along their pathway 2 . Brachial plexus block is a valuable and safe alternative to general anesthesia in upper limb surgeries. Interrupting the acute pain which can help in limiting the development of chronic pain syndromes 3, 4. The effects of opioids on regional blockade is controversial. So the present study is being undertaken to evaluate Fentanyl as an adjuvant to Ropivacaine in supraclavicular brachial plexus block.