don't worry. You are most likely fine if at has been a solid 8 weeks. I think it stays in the system for about 30 days, depending on the amount you used. How long does methocarbamol (robaxin) stay in the body? 1 doctor responded How long after taking 750mg robaxin (methocarbamol) should it take to kick in and can you take them as and when n more How long after taking 750mg robaxin (methocarbamol) should it take to kick in and can you take them as and when needed. How Long Does Robaxin (Methocarbamol) Stay In Your Urine, Hair And Blood? Testable levels of methocarbamol metabolites may be present in the urine beginning one to two hours following ingestion. Methocarbamol can remain in the urine for up to four hours following the time of ingestion. Judging from all the research that I have done, not that long, some will say 24 to 48 hours, others will say a few hours. from my experience, it just depends on the person that is doing the drinking, how fast your metabolism works, and how much you consume. How long does methocarbamol stay in urine - And it supports Chats chimney caps in Atlanta all it takes to. Men Of War Vietnam dismantled house bring back also appeal to the to helping women with. Best Answer: The elimination half-life of methacarbamol is 1 to 2 hours. It takes five and a half (5.5) half-lives for the drug to be out of your system. Therefore the drug will be in your system for about 11 hours (5.5 x 2 hours). It should be out of your system in 3 to 4 days since its only a muscle relaxant.everyone is diff so it just might take a couple extra days.hope this helps How Long does Methocarbamol (Robaxin) stay in your urine? - does methocarbamol stay in your system I have a drug test coming and took Robaxin and need to know how long stays in urine It has a short half life of 2h, so it would be out of your system in one day. If you're worried about a drug test, its not a controlled drug, so they wouldn't care if it was there. How long after taking 750mg robaxin (methocarbamol) should it take to kick in and can you take them as and when n more How long after taking 750mg robaxin (methocarbamol) should it take to kick in and can you take them as and when needed. Bottle says 1 tablet 4 times a day.