Tramadol.
D000701:Analgesics, Opioid / Q000494:pharmacology*; D000768:Anesthesia, General; D006801:Humans; D007432:Intraoperative Period; D011939:Mental Recall / Q000187:drug effects*; D014147:Tramadol / Q000494:pharmacology*
D000701:Analgesics, Opioid; D014147:Tramadol