Aim: To evaluate the use of dexamethasone as an adjuvant in supraclavicular blocks for surgical procedures involving the upper limbs. Materials and methods: Brachial plexus blocks were used throughout all of the procedures. After providing patients with written explanations of the full research procedure, permission on an ethical level was acquired from the institution's ethics committee, and patients gave their written agreement in order to participate in the study. The current investigation comprised a total of 120 patients, all of whom were assigned at random to one of two different research groups. Patients in group A were given bupivacaine in combination with dexamethasone, whereas patients in group B were given just bupivacaine. Results: The patients in group A had a mean age of 30.58±3.69 years, whereas the patients in group B had a mean age of 23.77±2.98 years. The patients in group A had a mean weight of 59.85± 6.67 kg, whereas the patients in group B had a mean weight of 61.98 ±5.55 kg. The patients in group A had a mean height of 169.98 cm with a standard deviation of 3.69 cm, whereas the patients in group B had a mean height of 167.99 cm with a standard deviation of 5.56 cm. The length of the operation was 165.98±6.69 minutes for group A patients and 154.99±4.58 minutes for group B patients on average. Patients in group A had a sensory block that lasted for an average of 4.99± 0.96 minutes, whereas patients in group B experienced a sensory block that lasted for 6.88 ±1.01 minutes. The mean duration of analgesia for patients in group A was 839.89 ±9.97 minutes, whereas the mean duration for patients in group B was 279 ±8.89 minutes. Conclusion: we concluded that the addition of dexamethasone to local anaesthetic drugs in brachial plexus block significantly prolonged the duration of analgesia and motor block in patients who were undergoing surgery on their upper limbs. This was the case in patients who had undergone brachial plexus block.