How Long Does Fentanyl Stay in Your System?
When taken intravenously, fentanyl has an elimination half-life of approximately 2 to 4 hours in adults, meaning it takes approximately 11 to 22 hours to completely leave your system.
Although many people had never heard of fentanyl before it claimed the life of the musician Prince in April 2016, this synthetic opiate pain reliever is one of the strongest opiates available today. It’s 50 to 100 times more potent than morphine. As a result, it’s often used to relieve severe pain, especially after surgery, during cancer treatment, and to manage breakthrough pain.
In its prescription form, fentanyl is known by names such as Actiq, Duragesic, and Sublimaze. However, many people obtain fentanyl without a prescription on the black market. When used for recreational purposes, fentanyl typically comes in the form of powder, spiked on blotted paper or mixed with heroin, cocaine or other street drugs to amplify the potency.
Fentanyl abuse is dangerous and even deadly. In March 2015, the Drug Enforcement Agency (DEA) issued a nationwide alert identifying fentanyl as a threat to public health and public safety.
- 1. How Long Does Fentanyl Stay in Your System?
- 2. How Long Does Fentanyl Stay in Your Urine?
- 3. How Long Does Fentanyl Stay in Your Hair?
- 4. How Long Does Fentanyl Stay in Your Blood?
- 5. How Long Does Fentanyl Stay in Your Saliva?
- 6. What Influences How Long Fentanyl Stays in Your System?
- 7. Will Fentanyl Show Up on a Drug Test?
To determine how long fentanyl will stay in your system after you stop taking it, it’s important to consider its elimination half-life. Elimination half-life refers to how long it takes for half of a single dose of a drug to leave the body.
The elimination half-life of fentanyl is subject to some variation based on the method by which it’s administered. When taken intravenously, fentanyl has an elimination half-life of approximately 2 to 4 hours in adults, meaning it takes approximately 11 to 22 hours to leave your system.
If you use the patch or lozenge, fentanyl exhibits a half-life of approximately seven hours, and it will take around 36 hours for the drug to completely leave your system after you stop using.
As fentanyl breaks down in your system, it leaves behind traces called metabolites. These metabolites stay in your system longer, meaning that a thorough drug test could detect fentanyl in your system even several days after you stop taking it.
- Body mass
- Body fat
- Food intake
- Hepatic function
- Metabolic rate
- Urinary pH
- Dosage (low vs. high)
- Route of administration
- Frequency of use
- Duration of use
- Use of other drugs
- Difficulty walking
- Muscle stiffness
- Slowed heart rate
- Labored breathing
- Dizziness, lightheadedness, and fainting
- Slurred speech
- Nausea and vomiting
- Itching and scratching
- Pinpoint pupils
Have more questions about Fentanyl abuse?Read the most frequently asked questions
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