How Long Does Flexeril Stay In Urine

Question

Asked by Nan

How Long Does Flexeril Stay In Urine

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

Answer

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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