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Fentanyl, including an 800 mg dose, typically stays in the system for 1 to 3 days, depending on various factors such as metabolism, frequency of use, and overall health. However, the effects of fentanyl may last only a few hours. Detectable traces may remain in urine for up to 72 hours, while blood tests can detect it for shorter periods. Always consult a healthcare professional for personalized information.

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1w ago

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