Health Topic

Opioid Overdose

Opioid overdose leads to slowing or stopping of breathing and sometimes death. You can take steps to help prevent an overdose, and respond to one with naloxone.

Reviewed Reviewed by a registered pharmacistGeneral information

Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.

About Opioid Overdose

Opioids, sometimes called narcotics, are a type of drug. They include strong prescription pain relievers such as oxycodone, hydrocodone, fentanyl, and tramadol. The illegal drug heroin is also an opioid.

A health care provider may give you a prescription opioid to reduce pain after you have had a major injury or surgery. You may get them if you have severe pain from health conditions like cancer. Some providers prescribe them for chronic pain.

Prescription opioids used for pain relief are generally safe when taken for a short time and as prescribed by your provider. However, people who take opioids are at risk for opioid use disorder (OUD) and overdose. These risks increase when these medicines are misused. Misuse can include taking more than your prescribed dose or taking it more often, using it to get high, or taking someone else's opioids.

Opioids affect the part of the brain that regulates breathing. When people take high doses of opioids, it can lead to an overdose, with the slowing or stopping of breathing and sometimes death.

An opioid overdose can happen for a variety of reasons, including if you:

  • Take an opioid to get high.
  • Take an extra dose of a prescription opioid or take it too often (either accidentally or on purpose).
  • Mix an opioid with other medicines, illegal drugs, or alcohol. An overdose can be fatal when mixing an opioid and certain anxiety treatment medicines, such as Xanax or Valium.
  • Take an opioid medicine that was prescribed for someone else. Children are especially at risk of an accidental overdose if they take medicine not intended for them.

There is also a risk of overdose if you are getting medications for opioid use disorder (MOUD). MOUD is a treatment for OUD. Many of the medicines used for MOUD are also controlled substances that can be misused.

Anyone who takes an opioid can be at risk of an overdose, but you are at higher risk if you:

  • Take illegal opioids
  • Take more opioid medicine than you are prescribed
  • Combine opioids with other medicines and/or alcohol
  • Have certain medical conditions, such as sleep apnea, or reduced kidney or liver function
  • Are over 65 years old

The signs of an opioid overdose include:

  • Very small pupils of the eyes
  • Falling asleep or loss of consciousness
  • Slow, shallow breathing
  • Choking or gurgling sounds
  • Vomiting
  • Limp body
  • Pale, blue, or cold skin
  • Faint heartbeat
  • Purple lips and fingernails

If you think someone is having an opioid overdose:

  • Call 911 immediately.
  • Give the person naloxone, if it is available. Naloxone is a safe medication that can quickly stop an opioid overdose. There are two forms. One is a nasal spray that you spray info the nose. The other type is injected into the muscle under the skin, or into the veins. Naloxone works by blocking the effects of the opioids on the body. It's important to read the product instructions and check the expiration date before you give it to someone.
  • Try to keep the person awake and breathing.
  • Lay the person on their side to prevent choking.
  • Stay with the person until emergency workers arrive.

Naloxone won't harm someone if they're overdosing on drugs other than opioids, so it's best to use it if you think someone is overdosing.

If you are taking opioid pain medicine, there are steps you can take to help prevent an opioid overdose:

  • Take your medicine exactly as prescribed by your provider. Do not take more medicine at once or take medicine more often than you are supposed to.
  • Never mix the pain medicines with alcohol, sleeping pills, or illegal substances.
  • Store your medicine safely where children or pets can't reach it. Consider using a medicine lockbox. Besides keeping children safe, it also prevents someone who lives with you or visits your house from stealing your medicines.
  • Dispose of unused medicine promptly.

It is also important to teach your family and friends how to respond to an overdose. If you are at higher risk of an overdose, you will want get naloxone and carry it with you wherever you go. You can buy naloxone at a pharmacy.

It sits within Substance Use and Disorders.

The lead U.S. institute for this subject is the National Institute on Drug Abuse.

When to speak to someone. Reading about a topic cannot tell you whether it applies to you. Speak to a doctor or pharmacist if symptoms are severe, sudden, getting worse, or simply not going away — and seek emergency care immediately for chest pain, breathing difficulty, sudden weakness or confusion, or a serious allergic reaction.

Research on Opioid Overdose

142 studies areregistered for this condition on ClinicalTrials.gov, the U.S. National Library of Medicine's public registry. A selection is below — the links go straight to the registry entry, not to a summary of ours.

What a registered study does and does not mean. Registration means a study exists and has been declared publicly. It says nothing about whether the treatment being tested works, is safe, or is available to you. Many studies find no benefit — that is what research is for. Never seek out an experimental treatment on the strength of a registry entry alone.

Research currently under way

Research already completed

Study data from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. Retrieved 2026-07-30. Registry entries are supplied by study sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.

Where to read more

Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.

Start Here

Treatments and Therapies

Prevention and Risk Factors

Genetics

Statistics and Research

Clinical Trials

Medical subject headings

Clinicians and researchers index this subject under Opioid-Related Disorders, Drug Overdose, Opiate Overdose. These are the terms to use when searching medical literature.

This page is built from the MedlinePlus health topic record for Opioid Overdose, a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.