The problem of inadequate post operative pain relief has been recognized for many years and has been the subject of considerable research. A recent concept for the relief of post operative pain has been production of such a preoperative analgesia which should have a reduced incidence of pulmonary, cardiovascular, thromboembolic and other complications with better free mobility. Aim of this study was to compare the efficacies and adverse effects of pentazocine, fentanyl and tramadol as pre-operative analgesics in patients undergoing short surgical procedures with post-operative ketorolac....