Naloxone is a medication that rapidly reverses opioid overdose. It is safe, effective, easy to administer, and available without a prescription in many jurisdictions. In contexts where opioid use may occur, access to naloxone is one of the most impactful harm reduction interventions available.
How Naloxone Works
Naloxone is an opioid antagonist. It works by binding to opioid receptors in the brain with high affinity, displacing opioids that are causing respiratory depression, and temporarily reversing their effects. The result is rapid restoration of normal breathing in someone experiencing an opioid overdose. Naloxone begins working within two to five minutes of administration and its effects last approximately 30 to 90 minutes. Because fentanyl and its analogues are more potent and longer-lasting than naloxone, multiple doses may be required for fentanyl overdoses.
Forms and Administration
Naloxone is available in two main forms for community use: nasal spray (such as Narcan) and injectable. Nasal spray formulations require no needles and can be administered by anyone with minimal training. The injectable form is slightly faster-acting and often less expensive, but requires a syringe for intramuscular or subcutaneous administration. Training on how to administer naloxone is provided free of charge by most harm reduction organisations that distribute it.
Recognising an Opioid Overdose
Key signs of an opioid overdose include slow, shallow, or stopped breathing; unresponsiveness to voice or touch; blue or grey skin, particularly around the lips and fingertips; gurgling or choking sounds; and pinpoint pupils. If these signs are present and opioid use is known or suspected, administer naloxone immediately and call emergency services.
How to Obtain Naloxone
Naloxone is available free of charge through local harm reduction organizations, syringe service programs, many pharmacies, and public health departments in many countries. In the United States, NEXT Distro provides mail-based naloxone distribution. In the UK, naloxone is available through drug treatment services and some pharmacies. The National Alliance of Advocates for Buprenorphine Treatment (NAABT) and local harm reduction coalitions maintain searchable directories of distribution sites.
Having naloxone available and knowing how to use it is one of the simplest and most effective ways to be prepared to help in the event of an opioid overdose. It saves lives, and access to it should be universal.