How Long Does Fentanyl Stay In Your System?

How Long Does Fentanyl Stay In Your System?

Fentanyl is a very powerful opioid that is prescribed for moderate to severe pain. While many pain clinic physicians will prescribe it in a transdermal form, because this method of administration reduces risks of overdose. This drug is also very commonly used during surgery to prevent the patient from feeling pain, so you may question how long it stays in the system.

Side Effects

If you suffer from any type of respiratory disorder, you should not take this drug unless prescribed by a physician. Respiratory suppression is a very serious symptom that can lead to death, if untreated. Other common, less serious side effects include:

  • Muscle stiffness
  • Dizziness
  • Fatigue
  • Nausea/vomiting
  • Itchy skin
  • Increased perspiration
  • Drowsiness

While these side effects are common and harmless, you may exhibit other side effects that are very dangerous. If you suffer from hypertension, you may see that your blood pressures are elevated at times. In this case, you should speak with your physician, because if your levels become extremely high, you may be at risk for a heart attack.


Fentanyl will stay in the body from anywhere between 1 ½ -2 months. If you follow the prescription instructions to a tee and never alter your dose, you will be at a lower risk for overdose. This is a very powerful opioid that should never be experimented with, because it can lead to overdose or death.


If you are pregnant or considering getting pregnant you should avoid this drug all together, because it can pass through the placenta to the unborn fetus. This will put your baby at risk of respiratory distress or death. Speak with your physician for another pain management alternative that will be much safer for you and your baby.

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Never combine alcohol with fentanyl, because this can worsen the side effects, which would be very dangerous.

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The team is composed of doctors and few students in their final year of medicine who have decided to popularize and share their knowledge.
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1 Comment
  1. Chanda May 31, 18:59 Reply
    I had to have surgery on my help and they gave me a hundred and 50 milligram of Fentanyl 9 days later I had went for my 3-month urine test and blood test and when I went in they said that I had fentanyl in my urine they cut me off of my Norcos I have a degenerative knee disease and back problems and I had to explain to them that I'd had surgery and they gave me fentanyl but they accused me of using pain patches they said that they didn't give him enough for surgery so I am having withdrawals of nausea sluggish diarrhea I don't know what to do because they done that to me
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