Heroin Overdose

How to Recognize a Heroin Overdose

A heroin overdose has three signs that appear together: pinpoint pupils, breathing that slows or stops, and a person you cannot wake. The lips and fingertips may turn blue or gray. If you see this, act now. A heroin overdose is survivable, and naloxone reverses it in minutes.

Heroin kills the same way every opioid does. It shuts down breathing^[1]. The brain stops driving the lungs, oxygen falls, and the heart stops soon after. Naloxone reverses that, and ordinary people give it every day to save a life. You do not need to be certain it was heroin, and you do not need to know how much they took. If someone is barely breathing and will not wake, treat it as an overdose.

The Three Signs of a Heroin Overdose

You are looking for three things together, sometimes called the opioid overdose triad: very small pupils, breathing that has slowed or stopped, and a person who will not respond^[8]. Any one of them in someone who may have used heroin is reason to act.

Breathing Is the Sign that Matters Most

The danger in a heroin overdose is the breathing. Heroin acts on opioid receptors in the brainstem, the part that runs automatic breathing, and turns that drive down^[9]. Watch for breaths that are slow, shallow, or far apart, or no breathing at all. A gurgling, gasping, or snore-like rasp, sometimes called the death rattle, is an emergency.

• Pinpoint pupils. The black center of the eye shrinks to the size of a pin. This is one of the clearest opioid signs.
• Slow or stopped breathing. Fewer than about one breath every 5 seconds, or long gaps, means oxygen is dropping.
• Blue or gray lips and fingertips. When breathing fails, the skin loses color. On darker skin, check the lips, gums, and nails. This bluish tint is called cyanosis, and it is a visible sign that blood oxygen has dropped, because the stalled breathing has stopped supplying it^[10].
• Cannot be woken. They do not respond to their name, a shake, or a hard knuckle rub on the breastbone.
• Limp body, pale and clammy skin. The whole body goes slack.

Overdose Versus Being Very High

People around drug use sometimes wait too long because they think someone is just nodding off. The table below shows the line. When in doubt, give naloxone and call 911. It will not harm someone who is only high.

If you cannot tell which side of that line someone is on, you are already in overdose territory. Give the naloxone.

What to Do During a Heroin Overdose

This is the part to remember even if you forget everything else. The steps are simple, and you do not need training to do them.

Act in This Order

• Call 911 first, or have someone else call while you start helping. Tell them someone is not breathing. You do not have to know what they took.
• Give naloxone. Spray one full dose into one nostril, or inject it into the outer thigh through clothing if needed. Naloxone is an opioid blocker that pushes heroin off the receptors and lets breathing return^[11].
• Give a second dose if needed. If there is no change after 2 to 3 minutes, give another dose. Because street heroin is usually cut with fentanyl, more than one dose is often needed^[3].
• Do rescue breathing between and after doses. Tilt the head back, lift the chin, pinch the nose, seal your mouth over theirs, and give a breath every 5 seconds. The longer the brain goes without oxygen the greater the risk of lasting brain injury, so keeping air moving is what protects the brain until help arrives^[10].
• Put them on their side once they are breathing, knee bent to keep them propped, so they do not choke if they vomit.
• Stay until help arrives. Naloxone can wear off before the opioids are gone, and breathing can fail again. Do not leave them alone, even if they wake up.

After Naloxone Works

When naloxone takes hold, the person may wake suddenly and feel terrible. Naloxone can bring on fast, rough withdrawal, so they may be confused, agitated, nauseated, or angry that their high is gone^[13]. That reaction is uncomfortable but not dangerous, and it means the medication worked. Keep them calm, keep them from using again right away, and keep them there for the ambulance. The withdrawal feeling means they are breathing, which is the whole point.

How Fentanyl Changed Heroin Overdoses

The biggest shift in heroin overdose is that most street heroin is no longer just heroin. It is cut with fentanyl, or is fentanyl sold as heroin. Fentanyl was first added to boost potency, then increasingly replaced heroin in the supply^[2]. Illicitly made fentanyl is roughly 50 to 100 times more potent than morphine, so a bag that looks the same as last week’s can be far stronger^[15].

This changes the overdose itself. It can come on faster, and it can take more than one dose of naloxone to reverse^[3]. People often cannot tell fentanyl is present at all, because it is mixed into the heroin supply without their knowledge^[16]. This is why fentanyl test strips, starting with a smaller amount, and keeping naloxone within reach matter so much for anyone using.

Other Dangers in a Heroin Overdose

Beyond stopped breathing, a heroin overdose can cause damage that makes calling 911 essential even after naloxone.

A few situations sharply raise the odds of a fatal overdose, and most are preventable.

• Fluid in the lungs. Heroin overdose can trigger a sudden flooding of the lungs called non-cardiogenic pulmonary edema, which makes breathing fail even when oxygen is given. It has been documented even when heroin was smoked rather than injected, so no route is risk-free^[18].
• Choking on vomit. An unconscious person can inhale vomit, which is why the recovery position matters.
• Mixing with other drugs. Combining heroin with benzodiazepines, alcohol, or cocaine raises the danger sharply. Using opioids together with sedatives like benzodiazepines multiplied the risk of a fatal opioid overdose in a large patient study^[19][20]. A “speedball” that mixes heroin with cocaine is especially unpredictable, because the stimulant can mask how much opioid has gone in.

What Raises the Risk of a Heroin Overdose

• Lost tolerance after time away. After detox, a hospital stay, or jail, the body’s tolerance drops fast. Going back to the old dose can be deadly. Overdose is the leading cause of death in the first two weeks after release from prison, when tolerance has fallen but the habit has not^[21][22]. Across more than a million people in eight countries, the week after release from incarceration carried the highest death risk, driven by drug poisoning^[23].
• A stronger or fentanyl-cut supply. Fentanyl is often sold deceptively as heroin, and users frequently have no reliable way to know what is in a given bag, so its strength is unpredictable^[24]. The dose that felt right last time can be too much this time.
• Using alone. Most overdoses are survivable if someone is there to call 911 and give naloxone. Using alone removes that lifeline.
• A recent overdose. Surviving one overdose is the single biggest warning sign for another. Nonfatal overdose is the leading risk factor for a later fatal one^[6].

How to Get and Use Naloxone

Naloxone, sold as Narcan, is the single most important thing to have if you or someone you love uses heroin. It is now available over the counter at pharmacies without a prescription, and many health departments and harm-reduction programs give it out free^[25].

Community naloxone programs save measurable numbers of lives. Areas that trained bystanders and handed out nasal naloxone saw lower opioid overdose death rates than areas that did not^[26]. A systematic review found that take-home naloxone programs reduce overdose deaths with very few downsides^[27]. When ordinary people gave it, most overdoses reversed: in one statewide program, more than 75 percent of people given bystander naloxone were breathing, talking, or walking within minutes^[4].

Using it is simple:

• Nasal spray. Peel it open, tip the head back, put the nozzle in one nostril, and press the plunger all the way. One device, one dose.
• Wait 2 to 3 minutes. If there is no response, give another dose in the other nostril.
• Keep going. Because heroin is usually cut with fentanyl, two or even three doses can be needed before breathing returns^[3].

Intranasal naloxone given by people without medical training reverses opioid overdose reliably and is as safe as the injected form^[28][5].

Preventing the Next Overdose

An overdose is a signal, not a verdict. Surviving one is the moment to change the odds, and there is a clear path.

The most protective step after an overdose is getting into treatment. Medication for opioid use disorder, buprenorphine and methadone, lowers the chance of a future overdose. Among overdose survivors, those who started these medications had a lower risk of overdosing again^[7]. This is medicine that works, not a test of willpower.

If you are afraid of withdrawal, that fear is exactly what these medications are built to handle. The way out runs through detox and medication, which make stopping far gentler than the sickness most people brace for, not white-knuckling it alone in a bedroom. To understand what you are up against, learn how heroin takes hold and what heroin withdrawal really involves, then see what a safe, supported heroin detox looks like. The medications that prevent the next overdose are covered in medication-assisted treatment.

Carry naloxone. Do not use alone. And if a close call has already happened, take it as the opening it is. If you suspect an overdose, call 911 now. For thoughts of suicide, call or text 988. To start the way out today, get matched with treatment.

Written by

Jessica Miller

Editorial Director

Jessica Miller is the Editorial Director of Addiction Help. Jessica graduated from the University of South Florida (USF) with an English degree and combines her writing expertise and passion for helping others to deliver reliable information to those impacted by addiction. Informed by her personal journey to recovery and support of loved ones in sobriety, Jessica's empathetic and authentic approach resonates deeply with the Addiction Help community.

Reviewed by

• Fact-Checked
• Editor

Kent S. Hoffman, D.O.

Co-Founder & Chief Medical Officer

Kent S. Hoffman, D.O. has been an expert in addiction medicine for more than 15 years. In addition to managing a successful family medical practice, Dr. Hoffman is board certified in addiction medicine by the American Osteopathic Academy of Addiction Medicine (AOAAM). Dr. Hoffman has successfully treated hundreds of patients battling addiction. Dr. Hoffman is the Co-Founder and Chief Medical Officer of AddictionHelp.com and ensures the website’s medical content and messaging quality.