Meta Analysis
Efficacy and safety of transdermal fentanyl and sustained-release oral morphine in patients with cancer and chronic non-cancer pain.
Curr Med Res Opin. 2004 Sep 1; 20 (9): 141914281419-28.
Review
Impact of morphine, fentanyl, oxycodone or codeine on patient consciousness, appetite and thirst when used to treat cancer pain.
Cochrane Db Syst Rev. 2014 May 29; 2014 (5): CD011056CD011056.
Randomized Controlled Trial
Gastrointestinal symptoms under opioid therapy: a prospective comparison of oral sustained-release hydromorphone, transdermal fentanyl, and transdermal buprenorphine.
Eur J Pain. 2009 Aug 1;13(7):737-43.