1. American Pain Society (APS). Principles of Analgesic Use. 7th ed. Chicago, IL: APS; 2016.
2. Grond S, Sablotzki A. Clinical pharmacology of tramadol. Clin Pharmacokinet 2004; 43(13): 879-923. doi: 10.2165/00003088-200443130-00004.
3. Raffa RB, Buschmann H, Christoph T, Eichenbaum G, Englberger W, Flores CM, et al. Mechanistic and functional differentiation of tapentadol and tramadol. Expert Opin Pharmacother 2012; 13(10): 1437-49. doi:
10.1517/14656566.2012.696097.
4. Fournier JP, Azoulay L, Yin H, Montastruc JL, Suissa S. Tramadol use and the risk of hospitalization for hypoglycemia in patients with noncancer pain.JAMA Intern Med 2015; 175(2): 186-93. doi: 10.1001/jamainternmed.2014.6512.
5. Shipton EA. Tramadol--present and future. Anaesth Intensive Care 2000; 28(4): 363-74. doi: 10.1177/0310057x0002800403.
6. Gasse C, Derby L, Vasilakis-Scaramozza C, Jick H. Incidence of first-time idiopathic seizures in users of
tramadol. Pharmacotherapy 2000; 20(6): 629-34. doi:10.1592/phco.20.7.629.35174.
7. Rehni AK, Singh I, Kumar M. Tramadol-induced seizurogenic effect: a possible role of opioid-dependent gamma-aminobutyric acid inhibitory pathway. Basic Clin Pharmacol Toxicol 2008; 103(3): 262-6. doi: 10.1111/j.1742- 7843.2008.00276.x.
8. Sun C, Mtchedlishvili Z, Erisir A, Kapur J. Diminished neurosteroid sensitivity of synaptic inhibition and altered
location of the alpha4 subunit of GABA(A) receptors in an animal model of epilepsy. J Neurosci 2007; 27(46): 12641- 50. doi: 10.1523/jneurosci.4141-07.2007.
9. Wightman RS, Perrone J, Erowid F, Erowid E, Meisel ZF, Nelson LS. Comparative analysis of opioid queries on erowid. org: an opportunity to advance harm reduction. Subst Use Misuse 2017; 52(10): 1315-9. doi: 10.1080/10826084.2016.1276600.
10. Shadnia S, Soltaninejad K, Heydari K, Sasanian G, Abdollahi M. Tramadol intoxication: a review of 114 cases. Hum ExpToxicol 2008; 27(3): 201-5. doi: 10.1177/0960327108090270.
11. Afshari R, Tashakori A. Tramadol overdose as a cause of serotonin syndrome: a case series. Clin Toxicol 2010; 48(4):
337-41. doi: 10.3109/15563651003709427.
12. Talaie H, Panahandeh R, Fayaznouri MR, Asadi Z, Abdollahi M. Dose-independent occurrence of seizure with tramadol.
J Med Toxicol 2009; 5(2): 63-7. doi: 10.1007/BF03161089.
13. Kroenke K, Krebs EE, Bair MJ. Pharmacotherapy of chronic pain: a synthesis of recommendations from systematic
reviews. Gen Hosp Psychiatry 2009; 31(3): 206-19. doi:10.1016/j.genhosppsych.2008.12.006.
14. Wijdicks EF, Hijdra A, Young GB, Bassetti CL, Wiebe S, Quality Standards Subcommittee of the American Academy
of Neurology. Practice parameter: prediction of outcome in comatose survivors after cardiopulmonary resuscitation (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology 2006; 67(2): 203-10. doi: 10.1212/01.wnl.0000227183.21314.cd.
15. Boora K. Tramadol. In: Enna SJ, Bylund DB, eds. xPharm: The Comprehensive Pharmacology Reference. New York:
Elsevier; 2007. p. 1-7. doi: 10.1016/B978-008055232-3.62788-6
16. Hoffman RS, Howland MA, Lewin NA, Nelson LS, Goldfrank LR. Goldfrank’s Toxicologic Emergencies. 10th ed. US: McGraw-Hill; 2015.
17. Musshoff F, Madea B. Fatality due to ingestion of tramadol alone. Forensic Sci Int 2001; 116(2-3): 197-9. doi: 10.1016/s0379-0738(00)00374-1.
18. Cock HR. Drug-induced status epilepticus. Epilepsy Behav 2015; 49: 76-82. doi: 10.1016/j.yebeh.2015.04.034.
19. Vignatelli L, Tonon C, D’Alessandro R, Bologna Group for the Study of Status Epilepticus. Incidence and shortterm
prognosis of status epilepticus in adults in Bologna, Italy. Epilepsia 2003; 44(7): 964-8. doi: 10.1046/j.1528-
1157.2003.63702.x.
20. Márquez-Romero JM, Zermeño-Pohls F, Soto-Cabrera E. Convulsive status epilepticus associated with a tramadol
overdose. Neurologia 2010; 25(9): 583-5. doi: 10.1016/j.nrl.2009.07.001. [In Spanish].
21. Mehrpour M. Intravenous tramadol-induced seizure:two case reports. Iranian Journal of Pharmacology and
Therapeutics 2005; 4(2): 146-7.
22. Boostani R, Derakhshan S. Tramadol induced seizure: A 3-year study. Caspian J Intern Med 2012; 3(3): 484-7.
23. Taghaddosinejad F, Mehrpour O, Afshari R, Seghatoleslami A, Abdollahi M, Dart RC. Factors related to seizure in
tramadol poisoning and its blood concentration. J Med Toxicol 2011; 7(3): 183-8. doi: 10.1007/s13181-011-0168-0.