Members been given a daily questionnaire for the initial 10 postoperative days. They were being requested to self-report:The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors on amounts of tramadol and M1 from tramadol hydrochloride tablets are complex. Use of cytochrome P450 3A4 induce