If someone cannot be woken and is breathing slowly, irregularly or not at all, call local emergency services immediately. Give naloxone if an opioid overdose is possible and it is available. Follow the device instructions and the emergency operator’s directions for breathing support or resuscitation. Do not wait to finish reading this guide.
Naloxone is an emergency medicine that reverses opioid effects. It can restore breathing, but its action may wear off before the opioid does. Someone who wakes after receiving it still needs emergency assessment and observation. This guide explains recognition, response, preparation and follow-up; it does not replace practical training or product instructions.
What is naloxone used for?
Naloxone treats a known or suspected opioid overdose. Relevant opioids include prescribed pain medicines and substances such as heroin or fentanyl. It is also used by clinicians when opioid medicines cause excessive respiratory depression. An overdose can be accidental and does not, by itself, establish an addiction diagnosis.
People taking prescribed opioids, their families and others who may witness an overdose can ask about keeping naloxone available. Risk assessment includes other medicines, previous overdose and interruptions in opioid use. Carrying a rescue medicine is a precaution, not an accusation that someone intends to misuse a prescription.
How naloxone helps restore breathing
Naloxone is an opioid antagonist. It temporarily blocks opioid receptors, counteracting effects that can suppress breathing and consciousness. The immediate goal is adequate breathing, not necessarily complete wakefulness. A person may need additional treatment even when there is some movement or response after a dose.
Naloxone cannot remove every substance from the body or reverse every cause of unconsciousness. It does not directly reverse alcohol or benzodiazepine poisoning. Nevertheless, give it when opioid involvement is possible, including suspected mixed-substance exposure. Emergency help and breathing support remain essential whether or not a response occurs.
Recognizing a possible opioid overdose
Warning signs include inability to wake the person, very slow or absent breathing, unusual snoring or gurgling, and blue, gray or unusually pale lips or skin. Pinpoint pupils can occur but are not required. Do not dismiss abnormal breathing as ordinary sleep or wait for every sign to appear.
An unfamiliar tablet or powder can contain an opioid without the person’s knowledge. Respond to breathing and responsiveness rather than relying on what someone thought they took. If you are unsure, describe the situation to emergency services and follow their instructions. Do not delay while trying to identify the drug.
What to do immediately
Check that approaching the person is safe. Call the emergency number and put the phone on speaker when possible. Ask another person to get naloxone and an automated external defibrillator if available. Give the rescue medicine promptly according to its instructions while emergency help is being arranged.
If breathing is absent or abnormal, follow the operator’s instructions for rescue breaths or cardiopulmonary resuscitation. Use an available defibrillator as directed. If the person is breathing normally but remains unconscious, place them in the recovery position and keep monitoring. Do not give food, drink or another drug.
Nasal sprays and injectable products
Naloxone comes in different nasal and injectable formulations. Brand examples include Narcan and Nyxoid, but availability and age indications vary by country and product. The instructions accompanying the actual device are the reference. Do not assume that different strengths or delivery systems are used in the same way.
Common single-use nasal devices deliver their contents into one nostril. Do not prime or test such a device: that wastes the dose. Each device is used once. Injectable kits require their own instructions and training. Keep the complete kit accessible rather than separating the medicine from the equipment needed.
When another dose may be needed
Common nasal-spray instructions advise another dose with a new device after two to three minutes if normal breathing has not returned. Follow the specific product and emergency operator’s directions. Continue breathing support as advised. Do not wait for naloxone to act before arranging emergency assistance.
Some opioids last longer than naloxone. Breathing can deteriorate again after an initial improvement, and another dose may be needed. A returning overdose is an emergency, not evidence that the person should be left to sleep. Stay with them and tell the arriving team what was administered and when.
Side effects and sudden withdrawal
In someone physically dependent on opioids, naloxone can bring on abrupt withdrawal. Symptoms may include nausea, vomiting, sweating, agitation, pain or a fast heartbeat. Withdrawal can be distressing, but fear of it must not delay treatment of potentially fatal respiratory depression. Emergency clinicians can assess complications and provide support.
Keep the area calm and explain what has happened when the person becomes responsive. Avoid arguing or making recovery decisions during the emergency. Vomiting creates a choking risk, so positioning and observation matter. Do not offer more opioids to relieve discomfort or let apparent improvement replace medical assessment.
What naloxone cannot do
Naloxone is not a preventive dose to take before using opioids, and it does not make an unknown drug supply safe. It cannot reliably undo harm from prolonged oxygen deprivation. Access to naloxone should sit alongside appropriate prescribing, safer support and treatment for substance-use problems where needed.
It is also not a complete treatment for opioid use disorder. Buprenorphine, methadone and naltrexone have different ongoing treatment roles and eligibility requirements. A rescue response and a recovery plan address different needs. Neither should be withheld because the other has not yet been arranged.
Pregnancy and other important circumstances
A suspected life-threatening opioid overdose requires immediate emergency care, including during pregnancy. Tell the emergency team about pregnancy when known, but do not delay the rescue response while searching for a specialist. Clinicians can assess the pregnant person, possible withdrawal and any additional monitoring that is appropriate.
Children and adolescents also need urgent assessment after suspected opioid exposure. Product licenses and instructions differ, so tell the operator the person’s age and follow their directions. This general guide is not a pediatric dosing protocol. In every age group, unconsciousness or abnormal breathing takes priority over routine medication questions.
Keeping naloxone accessible
Ask a pharmacist or local harm-reduction service which products are available and how to obtain training. Prescription and supply arrangements differ internationally. Check local requirements before travel rather than assuming that a medicine obtained in one country can be replaced in the same way elsewhere.
Check expiry dates and storage instructions. Avoid leaving the kit in extreme heat or cold, and replace used or damaged devices promptly. People likely to help should know where it is kept. An emergency kit hidden behind inaccessible storage is less useful when seconds matter.
After an overdose: continuing support
Emergency assessment remains necessary after apparent recovery. Give clinicians the suspected substances, prescription list, timing and number of naloxone doses when known. Being honest helps treatment. Do not let uncertainty about the exact amount taken delay care or lead to a falsely reassuring estimate.
After the emergency, discuss the cause and a practical prevention plan. This might involve a medication review, support for opioid use disorder or safer management of pain. Replace the rescue supply and review training. Nonjudgmental follow-up is more useful than assuming the event reveals someone’s character or motivation.
Preparing family members and carers
Review the kit together before an emergency. Practice locating the instructions and explaining the address to emergency services without discharging a real single-use device. Decide who would call, who would bring supplies and how responders could enter the building. Preparation should simplify action rather than create a complicated checklist.
Explain that the person needs observation even after waking and should not take further substances to counter withdrawal. Keep personal safety in mind if someone becomes confused or distressed. Training providers can demonstrate positioning and resuscitation using appropriate equipment, which written information alone cannot reproduce.
Ask for instructions in a language that the likely responder understands. Check whether the kit contains more than one dose and how replacement supplies are obtained. Write the emergency number and exact address where they can be found quickly. Review arrangements when moving home or changing care settings, rather than assuming that everyone already knows where the medicine is stored or kept.
