I'm on probation and have a drug test every week. I've read online with mixed reviews that both may come up false positive for benzos. Ive been taking the nurantin all weekend, around 1500mg a day (5 of the yellow 300mg caps), the flexeril i took on friday (4 of the 10mg tablets). I have the test tomorrow. I've also read that the nurantin doesnt metabolize into anything else but the excretes the body the same chemical it came out (gabapentin). Im not sure how the flexeril metabolizes. I'm aware that both of these are NOT scheduled narcotic drugs. However false positves can happen. I need some feedback from people that have had personnel experience with both of these drugs and urine drug testing...whether or not they failed, didnt fail, failed and had further testing to show you really didnt have narcotics in your system or what.