Treating a fentanyl overdose requires naloxone, a medication that blocks fentanyl’s effects on the brain, combined with rescue breathing and a call to 911. Fentanyl overdoses kill by shutting down breathing, and brain damage from oxygen deprivation can begin in minutes. Acting fast with the steps below is the single most important factor in survival.
Recognizing a Fentanyl Overdose
Before you can treat an overdose, you need to spot one. The hallmark signs are small, constricted “pinpoint” pupils, slow or absent breathing, and cold or clammy skin. The person’s lips and fingernails may turn blue or grayish, which signals their body is running out of oxygen. They will be unresponsive or extremely difficult to rouse.
If someone is unconscious and you can’t wake them by shouting their name or rubbing your knuckles firmly on their breastbone, treat the situation as an overdose. You do not need to be certain it’s fentanyl specifically. Naloxone works on all opioid overdoses, and giving it to someone who hasn’t taken opioids causes no harm.
Step 1: Call 911 Immediately
Call emergency services before doing anything else. Fentanyl has a half-life of roughly eight hours, while naloxone’s half-life is only about two hours. That means the naloxone can wear off while fentanyl is still active in the body, causing the person to stop breathing again. Professional medical monitoring is essential even if the person wakes up after receiving naloxone.
Nearly every U.S. state plus Washington, D.C. has both Good Samaritan and naloxone access laws on the books. These laws protect people who call 911 for an overdose or administer naloxone from certain drug-related charges. The specifics vary by state, but the intent is the same: you should never hesitate to call for help.
Step 2: Give Naloxone Nasal Spray
Naloxone nasal spray (commonly sold under the brand name Narcan) is available without a prescription at most pharmacies. It works by attaching to the same receptors in the brain that fentanyl targets, physically displacing the drug and reversing its effects. Each device contains one dose and cannot be reused.
To administer it:
- Lay the person on their back. Support the back of their neck with your hand and tilt their head slightly back.
- Open the package. Peel back the tab to remove the device. Do not test or prime it.
- Position your hand. Place your thumb on the bottom of the plunger and your index and middle fingers on either side of the nozzle.
- Insert the nozzle. Gently place the tip into one nostril until your fingers rest against the bottom of the person’s nose.
- Press the plunger firmly. This delivers the full dose. Remove the device from the nostril.
If the person does not wake up or start breathing normally within two to three minutes, give a second dose in the other nostril using a new device. You can continue giving additional doses every two to three minutes, alternating nostrils, until the person responds or paramedics arrive. Fentanyl overdoses often require more than one dose of naloxone because fentanyl binds to brain receptors more tightly than many other opioids.
Step 3: Start Rescue Breathing
If the person is not breathing or is only gasping, rescue breathing can keep oxygen flowing to the brain while you wait for naloxone to take effect. Tilt their head back to open the airway, pinch their nostrils closed, seal your mouth over theirs, and give one breath every five seconds. Watch for their chest to rise with each breath. Continue until they begin breathing on their own or help arrives.
You don’t need to perform full CPR with chest compressions unless you can’t detect a pulse at all. In most opioid overdoses, the heart is still beating. The problem is that the brain has stopped sending the signal to breathe. Rescue breathing addresses that directly.
Step 4: Use the Recovery Position
Once the person is breathing, or between doses of naloxone, place them on their side in the recovery position. This prevents vomit from blocking their airway, which is a real risk during and after an overdose.
To do this: raise the arm closest to you above their head, then gently roll them toward you while protecting their head from hitting the ground. Their head should rest in front of their arm, not on top of it. Tilt the head slightly upward to keep the airway open, and tuck their nearest hand under their cheek to hold that position. Stay with them and check their breathing frequently.
What Happens After Naloxone Works
When naloxone reverses an overdose in someone whose body is dependent on opioids, it can trigger sudden withdrawal. This happens because the drug strips fentanyl off every receptor in the brain at once. The person may experience yawning, stomach cramps, runny nose, tearing eyes, agitation, and nausea within minutes of waking up. These symptoms are intensely unpleasant, and the person may be confused, frightened, or even hostile.
This is important to anticipate for two reasons. First, the person may want to leave or refuse further help. Try to keep them calm and explain what happened. Second, some people use more opioids immediately after waking to stop withdrawal symptoms, which can cause a second overdose, especially once the naloxone wears off.
Do not leave the person alone. Because naloxone’s effects last roughly two hours while fentanyl stays active for much longer, the overdose can return once the naloxone is metabolized. This is the core reason why emergency medical care is not optional, even if the person appears fully recovered.
Where to Get Naloxone
Naloxone nasal spray is sold over the counter at most major pharmacy chains in the United States. Many community health organizations, harm reduction programs, and local health departments also distribute it for free. Each package comes with two nasal spray devices. Given that fentanyl overdoses may need multiple doses, carrying two packages (four total doses) is a reasonable precaution if you’re in a situation where overdose risk is elevated.
Store it at room temperature and check the expiration date periodically. Expired naloxone loses potency over time but is still better than no naloxone at all in an emergency.