Wednesday, October 22, 2014

Thursday, April 24, 2008 Nan, Community Member, asks

Q: how long does flexeril stay in urine

I wanted to know how many days Flexeril stays in your blood stream. Also will it show up in a drug screening?

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Answers (2)
Karen Lee Richards, Health Guide
4/28/08 5:36pm

Yes, Flexeril will show up in a drug screening. 


How long a drug stays in your blood and/or urine is usually determined by its half-life.  The half-life of a drug is the time it takes your body to metabolize and excrete the medication so that half of it is removed from your body.  Generally speaking, it takes five half-lives to fully eliminate a drug from your blood or urine.  Flexeril has a half-life of 18 hours, so it would take 3.75 days for it to clear out of your body completely.


Keep in mind that half-life can vary from patient to patient, so this is not a hard and fast rule.  Half-life is also affected if the patient has altered kidney or liver function.

Curious, Community Member
7/ 1/09 5:15pm

What does Flexeril show up as? Which class?

zeina, Community Member
7/ 8/09 1:20pm

i want know how many days u need to start felling butter wen you take a flexeril

Al, Community Member
4/26/08 10:11pm



It could stay up tp 2 weeks, yes it can show up in screening.



A nurse, Community Member
4/27/10 6:56pm

You clearly have no idea what you are talking about. Flexeril will not show up in a drug screen and it takes only 3 to 4 days to be eliminated from your system.

curious, Community Member
3/10/11 10:58pm

what does flexeril show up as on a drug screening?

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By Nan, Community Member— Last Modified: 07/22/13, First Published: 04/24/08