BACKGROUNDThe addition of adjuncts like Neostigmine, opioids, midazolam, dexmedetomidine, hyaluronidase, clonidine etc., to local anaesthetics for brachial plexus block may enhance the quality and duration of analgesia. Fentanyl, a phenylpiperidine derivative, is known to produce antinociception and enhance the effect of local anaesthetics when given epidurally or intrathecally. The purpose of the present study is to assess the effect of fentanyl added to brachial plexus block by axillary approach.