Fentanyl
Why illicit fentanyl changed overdose risk, how it ends up in other drugs, and how to reduce the danger.
What fentanyl is
Fentanyl is a synthetic opioid. Pharmaceutical fentanyl is prescribed for severe pain, often in hospitals. Most overdoses involving fentanyl in the U.S. are linked to illegally made fentanyl, which is sold on its own or mixed into other drugs.5
The CDC describes fentanyl as up to 50 times stronger than heroin and 100 times stronger than morphine.9 Very small amounts can stop someone's breathing.
Fentanyl in other drugs
Fentanyl has been found in heroin, counterfeit pills made to look like prescription opioids or anti-anxiety medicines, and stimulants such as cocaine and methamphetamine.9 People can be exposed without knowing it, including people who do not normally use opioids and have no tolerance.
Treatment
Fentanyl use disorder is treated as opioid use disorder, with methadone, buprenorphine, or extended-release naltrexone plus support.6 Starting buprenorphine after fentanyl use can be more complicated because of how fentanyl is stored in the body; clinicians use adjusted approaches, so tell your provider what you have been using.
Research references
- Fentanyl — Overdose Prevention (opens another website)Centers for Disease Control and Prevention (CDC)Link checked October 17, 2026
- TIP 63: Medications for Opioid Use Disorder (opens another website)Substance Abuse and Mental Health Services Administration (SAMHSA), 2018 (updated editions since)Link checked October 17, 2026
- Fentanyl Facts (opens another website)Centers for Disease Control and Prevention (CDC)Link checked October 17, 2026
Where to get help
911
For a medical emergency or immediate danger: possible overdose, someone who cannot be woken, trouble breathing, seizures, chest pain, severe confusion, or a risk of violence.
988 Suicide & Crisis Lifeline
Free, confidential support from trained crisis counselors for anyone in emotional distress or crisis — including if you are worried about someone else. Veterans and service members can call 988 and press 1, or text 838255.
Poison Help Line
Expert advice if someone may have taken too much of a substance or medicine, or mixed substances. If the person is unresponsive or not breathing normally, call 911 first.
SAMHSA National Helpline
Confidential treatment referral and information for people and families facing substance use or mental health conditions. It connects you to local treatment, support groups, and community organizations.
These are U.S. services. Outside the U.S., contact your local emergency number. See all verified resources.
Editorial draft — awaiting qualified clinical review
This page was researched and written by the GAREP editorial process with AI assistance and checked against the sources listed. It has not yet been reviewed by a licensed clinician. Use it to understand and prepare, not to make medical decisions on your own.
GAREP Editorial (AI-assisted draft)
Written to be useful in any country. Services and medication availability differ by country.
- Published
- October 17, 2026
- Updated
- October 18, 2026