Central neuraxial blockade is the most popular technique of anaesthesia for lower limb surgeries. It is having several advantages like easy technique, economic and provides good quality of anesthesia. It decreases blood loss, avoid risk of intubation and aspiration, provides early ambulation Bupivacaine is most commonly used local anaesthetic drug for spinal anaesthesia but cardiotoxicity is the limiting factor. Levobupivacaine is having similar clinical profile with less cardio toxicity than Bupivacaine is gaining popularity 

It has demonstrated less affinity and strength of inhibitory effect on the inactivated state of cardiac sodium channels than the Bupivacaine and faster protein binding rate. To provide good quality of intra operative anesthesia with postoperative analgesia different additives like Opioids, Ketamine, Midazolam, Neostigmine andα2 adrenergic agonist are usedAlpha-2 adrenergic agonists have both analgesic and sedative properties when used as adjuvants to regional anesthesia. By action at the α2-receptor in spinal and supraspinal sites, they potentiate the effect of local anesthetics and allow a decrease in the required doses. These salutary effects are achieved without causing respiratory depression or excessive sedation. Clonidine is a selective partial α-2 adrenergic agonist provides effective, prolonged and dose dependent analgesia with a consequently decreased requirement of supplemental analgesics. The α2 adrenergic agonist clonidine has a variety of different actions, including the ability to potentiate the effects of local anesthetics. However, unlike spinal opioids, clonidine does not produce pruritis or respiratory depression. Dexmedetomidine, a highly selective α2 adrenergic agonist has emerged as a valuable adjunct to regional anesthesia and analgesia. It has become of the frequently used drugs, due to its hemodyanamic, sedative, anxiolytic, analgesic, neuroprotective and anaesthetic sparingeffects. Extensive search of literature reveals that though the studies have been conducted with our additives with the drug bupivacaine, but a specific study comparing the additive effect of both the drugs with the recently introduced drug Levobupivacaine and a suitable dose required intrathecally has not done extensively. Therefore, the present study is designed to compare the effect of intrathecal clonidine and dexmedetomidine as an adjuvant to Levobupivacaine in subarachnoid block. The specific outcome measures to define the performance of our study will primarily include comparing the effect of both the adjuvant drugs administered on the duration of motor and sensory blockade.