A suspected overdose is an emergency, even when the substance or amount is unknown. This practical checklist explains warning signs, the safest immediate steps, what to tell responders, and how to adapt your response for opioids, medicines, children, and other situations.
Overview
An overdose occurs when a substance overwhelms the body. It may involve prescription medicine, over-the-counter products, alcohol, recreational drugs, household chemicals, or a combination. You do not need to identify the substance or wait for certainty before getting help. If someone is difficult to wake, breathing abnormally, having a seizure, or showing signs of serious illness, treat the situation as an emergency.
Call your local emergency number immediately. In the United States and Canada, this is usually 911; elsewhere, use the appropriate local service. Put the phone on speaker if possible so you can follow the dispatcher’s instructions while helping. Do not leave the person alone to look for information, transport them without medical advice, or assume that sleep will make the situation safer.
Overdose symptoms can vary. Warning signs may include extreme sleepiness, confusion, loss of consciousness, slow, shallow, irregular, or stopped breathing, choking or gurgling sounds, blue or gray lips or fingertips, vomiting, seizures, severe agitation, chest pain, dangerously high or low body temperature, or sudden collapse. Some substances cause stimulation rather than sleepiness, and symptoms may change over time. When in doubt, respond as though the person needs urgent care.
Checklist by scenario
If the person is unconscious or hard to wake
- Check that the scene is safe. Avoid spilled chemicals, needles, smoke, fire, traffic, or other hazards. Do not expose yourself to an unknown substance.
- Try to wake the person. Speak loudly and tap the shoulder. Do not shake a baby or young child.
- Call emergency services. Say that you suspect an overdose and give the location first. Follow the dispatcher’s questions and instructions.
- Check breathing. If the person is not breathing normally, begin the emergency response steps directed by the dispatcher. If you are trained and able to provide CPR or rescue breathing, follow that training.
- Place a normally breathing, unconscious person on their side. The recovery position can help keep the airway open and reduce the risk of choking. Continue watching their breathing.
If an opioid overdose is possible
Use naloxone if it is available and you know how to administer it. Naloxone is intended to reverse opioid effects, but it does not replace emergency care. Give it according to the product instructions or dispatcher guidance. If the person does not respond, emergency guidance may call for another dose after the recommended interval. Stay with the person, monitor breathing, and be prepared to provide CPR or rescue breathing if directed. Naloxone may wear off before the opioid does, so a person who improves still needs medical evaluation.
If the person is having a seizure
Move nearby hard or sharp objects away if you can do so safely. Protect the head with something soft, track how long the seizure lasts, and do not restrain the person or place anything in their mouth. Do not give food, drink, or medicine until they are fully alert. Call emergency services, especially if the seizure is prolonged, repeats, follows a suspected overdose, causes injury, or the person has trouble breathing afterward.
If a child may have swallowed a medicine or chemical
Call emergency services or your local poison information service immediately, according to the seriousness of the situation and local guidance. Keep the container, packaging, label, or remaining product nearby. Do not induce vomiting and do not give food, drink, or another medicine unless a qualified professional instructs you to do so. Young children, older adults, pregnant people, and anyone with a serious medical condition may need especially prompt assessment.
If the person is awake but unwell
Keep them in a calm, supervised area and call for professional advice. Watch for worsening drowsiness, breathing changes, vomiting, confusion, chest pain, severe anxiety, overheating, or collapse. Do not encourage them to walk around, take a cold shower, drink coffee, or use another substance to counteract the first one. These actions do not reliably reverse an overdose and may create additional risks.
What to double-check
When responders arrive, share what you know without guessing. Useful details include the person’s age and approximate weight, what may have been taken, how much and when, whether alcohol or other substances were involved, current symptoms, known medical conditions, allergies, regular medicines, and any naloxone already given. Tell responders if the person vomited, seized, fell, or stopped breathing. Keep packages, labels, pill organizers, and photographs of products available if doing so is safe.
Check the person’s breathing repeatedly rather than relying on a single improvement. A person who wakes after naloxone, vomiting, or stimulation can become unresponsive again. Follow the emergency dispatcher’s instructions even if they differ from general information in this article. Local emergency systems, naloxone products, and poison information services may provide different instructions based on the situation.
Protect privacy and dignity, but do not delay care because you are worried about embarrassment or possible consequences. Accurate information helps clinicians choose safer treatment. If there may be a dangerous substance in the environment, tell responders before they enter or approach.
Common mistakes
- Waiting for certainty: A suspected overdose is enough reason to seek urgent guidance.
- Letting someone “sleep it off” alone: Unusual sleepiness can progress to breathing failure.
- Inducing vomiting: Vomiting can cause choking or further injury, particularly after loss of consciousness.
- Using stimulants or home remedies: Coffee, cold showers, exercise, and extra medicines do not reliably reverse overdose effects.
- Putting something in the mouth during a seizure: This can cause injury or choking. Do not restrain the person.
- Assuming naloxone solves the emergency: It may reverse opioid effects temporarily, but the person still requires monitoring and medical assessment.
- Leaving before help arrives: Responders need information about what happened, and symptoms can return or worsen.
When to revisit
Revisit this checklist before a planned trip, after a household medication change, when caring for a new family member, or whenever naloxone, first-aid supplies, or emergency contacts are replaced. Confirm that medicines are stored securely, labels are readable, and local emergency and poison-service numbers are saved. If opioids may be present, review where naloxone can be obtained and check its expiration and packaging according to the product instructions.
After any suspected overdose, arrange medical follow-up even if the person appears recovered. A clinician can assess delayed effects, interactions, injuries, withdrawal, and the need for ongoing support. For substance-use concerns, ask a healthcare professional about treatment and harm-reduction options. If the crisis involves immediate emotional danger or thoughts of self-harm, call emergency services; in the United States, call or text 988 for crisis support when the situation is not an immediate medical emergency.
Keep the action sequence simple: make the scene safe, call for help, check breathing, use naloxone when opioid overdose is possible, provide first aid as directed, and stay with the person until professionals take over. This article is general education and does not replace emergency instructions from a dispatcher or medical professional.
