1. Tramadol;Scott;Drugs,2000
2. Tramadol, pharmacology, side effects, and serotonin syndrome: a review;Kaye;PainPhys.,2015
3. Tramadol for neuropathic;Duhmke;Pain,2004
4. Tramadol deaths in Northern Ireland: a review of cases from 1996 to 2012;Randall;J. Forensic Leg. Med.,1996
5. The experimental toxicology of tramadol: an overview;Matthiesen;Toxicol. Lett.,1998