Aim: To compare the sensory and motor blocking properties 0.5% Levobupivacaine + Dexmedetomidine or Fentanyl combinations in supraclavicular brachial plexus block using nerve stimulator for elective upper limb surgeries. Material and Methods: Sixty patients aged between 18 – 60 years belonging to ASA class I and II posted for elective upper limb surgeries were randomly divided into two groups. Each group consisting of 30 patients to receive supraclavicular brachial plexus block with 30 cc of 0.5% Levobupivacaine + 50μg, 0.5 cc Dexmedetomidine (group D) and 30 cc of 0.5 % Levobupivacaine + 100mg, 2 cc Fentanyl (group F). Results: 0.5% Levobupivacaine + Dexmedetomidine combination have quick onset of sensory and motor blockade than 0.5% Levobupivacaine + Fentanyl. There is significant prolongation in duration of sensory and motot blockade with 0.5 % Levobupivacaine + Dexmedetomidine than 0.5% Levobupivacaine + Fentanyl. Conclusion: It can be concluded that while adding Dexmedetomidine as an adjuvant to 0.5 % Levobupivacaine produces quick onset of sensory and motor blockade, more prolonged duration of sensory blockade and more prolongation in duration of analgesia than with Fentanyl.