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Thread: How long does fentanyl stay in your system

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    dezbah1911's Avatar
    dezbah1911 is offline Junior Member
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    Default How long does fentanyl stay in your system

    How long does it stay in your urine.

  2. #2
    I Trance's Avatar
    I Trance is offline Junior Member
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    Oct 2008
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    Fentanyl has a sort half life, partially depending on the way it is given. Injectable Fentanyl's half life is about 4 hours, so a single 50mcg dose is probably undetectale in urine within 2 days. Longer dosing periods could run this up to 34 days, and multiple day
    administration of Fentanyl by a topical patch could extend this to 5 days.

    There are a lot of variables, so it is difficult to predict without knowing your own personal physiological parameters, total dose received, and by which route, etc.

    Certain disease conditions, impaired renal function, impaired liver function, could extend these times longer.

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