“…However, when assessing the clinical relevance of these potentially beneficial effects, several issues need to be considered and the authors concluded that despite many published randomized trials, the role of ketamine, as a component of perioperative analgesia, remains unclear. 26 6 Other drugs Clonidine, 27 neostigmine 28 and magnesium 29,30 also have potential benefits in reducing postoperative pain. The role of cannabinoids in postoperative pain management has been recently evaluated.…”