Fentanyl is a strong medicine made from opioids (chemicals used to treat sudden and ongoing pain). It’s up to 100 times stronger than other opioids like morphine, heroin, or oxycodone.
Drug dealers often sell fentanyl as fake oxycodone. Buyers may think they’re getting oxycodone, but they’re getting another opioid drug that has fentanyl and other substances in it. On the street, these drugs have nicknames like:
People take fentanyl to help with pain (such as cancer pain) that other medicine has not been able to help with. Others may use it to get high or to help with sleep.
Fentanyl is much stronger than oxycodone and many other opioids. When fentanyl is taken by mouth or by intravenous (IV) injection, it has a stronger effect than most other opioids.
The only way to be sure your fentanyl is real is to get it prescribed by a doctor. You can take it safely by following your doctor’s directions and taking the recommended dose. However, drugs you buy on the street are never safe.
Yes, it can poison you if you take too much. Early signs of fentanyl poisoning may include:
The most dangerous side effect of fentanyl is it can cause you to stop breathing, which can lead to death.
Yes, fentanyl can be addictive. If you use opioids a lot, you may find that you develop a tolerance and need more and more to feel the same effects. You can become mentally and physically dependent on fentanyl.
People addicted to fentanyl may have withdrawal symptoms when they quit, including:
Mild withdrawal symptoms usually start between 12 to 30 hours after the last time you took fentanyl. While the worst symptoms pass within a few days, it can take months to feel normal. Opioid withdrawal can be very uncomfortable, so it's best to stop using them under supervised care.
Fentanyl is safe when it’s prescribed by a doctor and taken as directed. Fentanyl patches or lozenges release the medicine slowly. You can poison yourself if you change the medicine to get a stronger or faster effect.
Illegal fentanyl has an unknown amount of fentanyl and may contain other substances such as cocaine, heroin, and xylazine (a drug given to animals to help with pain), which put users at higher risk of being poisoned.
Naloxone can reverse symptoms of fentanyl and other opioid poisoning. However, it doesn’t work every time, and the effects of the naloxone may not last as long as the opioid.
To help someone with fentanyl poisoning:
If you think you have fentanyl poisoning:
If you’re concerned about your own, or someone else’s,
fentanyl use, or you want more information on drug use, contact the Addiction and Mental Health Helpline 24 hours a day, 7 days a week, at
The Poison and Drug Information Service (PADIS) is a free, confidential, 24/7 service for all Albertans. Staff are specially trained to assess and manage exposures to drugs and toxins like fentanyl. Call, 1-800-332-1414.
Current as of: August 10, 2023
Author: Poison and Drug Information Service (PADIS)
This material is not a substitute for the advice of a qualified health professional. This material is intended for general information only and is provided on an "as is", "where is" basis. Although reasonable efforts were made to confirm the accuracy of the information, Alberta Health Services does not make any representation or warranty, express, implied or statutory, as to the accuracy, reliability, completeness, applicability or fitness for a particular purpose of such information. Alberta Health Services expressly disclaims all liability for the use of these materials, and for any claims, actions, demands or suits arising from such use.