• Karen Lee Richards
    Health Guide
    April 28, 2008
    Karen Lee Richards
    Health Guide
    April 28, 2008

    Flexeril won't typically show up in an ordinary urine drug test, though perhaps it would show up on a blood test. If you're on the medication prescribed by a doctor it shouldn't affect your screening the way a street drug would, particularly since there's a place on most drug tests for you to reveal what medications you're on.


    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.


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