Intrathecal opioid administration has been demonstrated to provide effective postoperative analgesia after a variety of surgical procedures, albeit at the cost of an increased risk for respiratory depression. Tramadol, in contrast, is a centrally acting analgesic that has minimal respiratory depressant effects, by virtue of its 6000-fold decreased affinity for mu receptors compared with morphine.  It also inhibits serotonin and norepinephrine reuptake in the spinal cord and has no reported neural toxicity. Accordingly, tramadol has the potential to provide effective postoperative analgesia with no risk of respiratory depression after central neuraxial administration. Although epidural tramadol has been demonstrated to provide adequate postoperative analgesia in patients undergoingmajor abdominal surgery and Caesarean section, its efficacy after intrathecal administration has not yet been studied well. Now a days various adjuvants are used in spinal anesthesia like dexmedetomadin and fentanyl to prolong the duration of sensory blockade and post op analgesia, but tramadol is far more cost effective than dexmedetomedin and other adjuvants. So, The study is undertaken to evaluate the duration of analgesia and/or pain free period produced by intra thecal tramadol added to bupivacaine heavy in pts undergoing any infra umbilical surgery.