1: Cepeda MS, Sutton A, Weinstein R, Kim  M. Effect of Tapentadol Extended Release on Productivity: Results From  an Analysis Combining Evidence From Multiple Sources. Clin J Pain. 2011  Jun 3. [Epub ahead of print] PubMed PMID: 21646907.
2: Etropolski M, Kelly K, Okamoto A, Rauschkolb C. Comparable efficacy  and superior gastrointestinal tolerability (nausea, vomiting,  constipation) of tapentadol compared with oxycodone hydrochloride. Adv  Ther. 2011 May;28(5):401-17. Epub 2011 Apr 13. PubMed PMID: 21494892.
3: Guay DR. Oral hydromorphone extended-release. Consult Pharm. 2010  Dec;25(12):816-28. Review. PubMed PMID: 21172762.
4: Schwartz S, Etropolski M, Shapiro DY, Okamoto A, Lange R, Haeussler  J, Rauschkolb C. Safety and efficacy of tapentadol ER in patients with  painful diabetic peripheral neuropathy: results of a  randomized-withdrawal, placebo-controlled trial. Curr Med Res Opin. 2011  Jan;27(1):151-62. PubMed PMID: 21162697.
5: Schwartz S, Etropolski M, Shapiro DY, Okamoto A, Lange R, Haeussler  J, Rauschkolb C. Safety and efficacy of tapentadol ER in patients with  painful diabetic peripheral neuropathy: results of a  randomized-withdrawal, placebo-controlled trial. Curr Med Res Opin. 2010  Dec 2. [Epub ahead of print] PubMed PMID: 21126106.
6: Oh C, Rengelshausen J, Mangold B, Etropolski M, Rauschkolb C, Wang  SS, Upmalis D, Häufel T. A thorough QT/QTc study of multiple doses of  tapentadol immediate release in healthy subjects. Int J Clin Pharmacol  Ther. 2010 Oct;48(10):678-87. PubMed PMID: 20875374.
7: Vorsanger G, Xiang J, Okamoto A, Upmalis D, Moskovitz B. Evaluation  of study discontinuations with tapentadol inmmediate release and  oxycodone immediate release in patients with low back or osteoarthritis  pain. J Opioid Manag. 2010 May-Jun;6(3):169-79. PubMed PMID: 20642246.
8: Wild JE, Grond S, Kuperwasser B, Gilbert J, McCann B, Lange B, Steup  A, Häufel T, Etropolski MS, Rauschkolb C, Lange R. Long-term safety and  tolerability of tapentadol extended release for the management of  chronic low back pain or osteoarthritis pain. Pain Pract. 2010  Sep-Oct;10(5):416-27. doi: 10.1111/j.1533-2500.2010.00397.x. PubMed  PMID: 20602712.
9: Afilalo M, Etropolski MS, Kuperwasser B, Kelly K, Okamoto A, Van Hove  I, Steup A, Lange B, Rauschkolb C, Haeussler J. Efficacy and safety of  Tapentadol extended release compared with oxycodone controlled release  for the management of moderate to severe chronic pain related to  osteoarthritis of the knee: a randomized, double-blind, placebo- and  active-controlled phase III study. Clin Drug Investig.  2010;30(8):489-505. doi: 10.2165/11533440-000000000-00000. PubMed PMID:  20586515.
10: Buynak R, Shapiro DY, Okamoto A, Van Hove I, Rauschkolb C, Steup A,  Lange B, Lange C, Etropolski M. Efficacy and safety of tapentadol  extended release for the management of chronic low back pain: results of  a prospective, randomized, double-blind, placebo- and active-controlled  Phase III study. Expert Opin Pharmacother. 2010 Aug;11(11):1787-804.  Erratum in: Expert Opin Pharmacother. 2010 Nov;11(16):2773. PubMed PMID:  20578811.