Background:Ambulatory anorectal surgery is an appealing approach for patients and physicians due to its increased efficiency and decreased surgical costs. The present study was conducted to evaluate intrathecaldexmedetomidine as adjuvant for spinal anaesthesia for perianal ambulatory surgeries. Materials & Methods:50 adult patients presenting for perianal surgeries were divided into 2 groups of 25 each. Group I patients received intrathecal 0.5% hyperbaric bupivacaine 6 mg (1.2 ml) with injection dexmedetomidine 5 μg in 0.5 ml of distilled water and group II received intrathecal 0.5% hyperbaric bupivacaine 6 mg (1.2 ml) with 0.5 ml of distilled water. The parameters such as time to regression of sensory blockade, motor blockade, ambulation, time to void, first administration of analgesic wasassessed