Exposure to immediate-release tramadol in children 6 years and under - a nationwide French poison control center study.
Acute toxicity related to misuse (nonmedical use) of tramadol: Experience of the European Drug Emergencies Network Plus.
Tramadol overdose causes seizures and respiratory depression but serotonin toxicity appears unlikely.
Influence of oral tramadol on the dynamic ventilatory response to carbon dioxide in healthy volunteers.