Randomized Controlled Trial
Tramadol for pain relief in children undergoing adenotonsillectomy: a comparison with dextromethorphan.
Laryngoscope. 2008 Sep 1;118(9):1547-9.
Randomized Controlled Trial
Randomized double-blind, double-dummy crossover clinical trial of oral tramadol versus rectal tramadol administration in opioid-naive cancer patients with pain.
Support Care Cancer. 2005 Sep 1;13(9):702-7.
Review
Tramadol sustained-release capsules.
Drugs. 2006 Jan 1; 66 (2): 223-30.