oxycodone (Oxycontin, Roxicodone) morphine (MS Contin, Kadian) fentanyl (Duragesic, Actiq) methadone codeine tramadol (ConZip, Ultram) How common is Opioid-Induced Constipation? You probably already know that opioid use is accompanied by many side effects like sedation, nausea, and drug tolerance...