“…Methadone, codeine, hydrocodone (Vicodin, Lortab), oxycodone, propoxyphene (Darvon), fentanyl (Duragesic, Actiq, Oralet), tramadol (Ultram), hydromorphone (Dilaudid), morphine (MS-Contin and others), and levorphanol (Levo-Dromoran) are among the most commonly prescribed opioids [1, 2]. They are used for pain management in a number of acute and chronic medical conditions including chronic non-cancer pain [3], post-surgical care [4, 5], and musculoskeletal pain [6]. In addition, they are also prescribed for non-pain conditions such as multiple sclerosis [7, 8].…”