Randomized Controlled Trial
Double-blind randomized study of tramadol vs. paracetamol in analgesia after day-case tonsillectomy in children.
Eur J Anaesthesiol. 2000 Sep 1;17(9):576-82.
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.
Randomized Controlled Trial
Preemptive analgesia with tramadol and fentanyl in pediatric neurosurgery.
Childs Nerv Syst. 2000 Feb 1;16(2):93-9; discussion 100.