What is Naloxone? Naloxone, (also known as Narcan®) is a medication called an “opioid antagonist” used to counter or reverse the effects of opioid overdose, for example morphine and heroin overdose. Specifically, naloxone is used in opioid overdoses to counteract life-threatening depression of the central nervous system and respiratory system, allowing an overdose victim to breathe normally. Naloxone is a nonscheduled (i.e., non-addictive), prescription medication.
Naloxone only works if a person has opioids in their system; the medication has no effect if opioids are absent. Naloxone can be administered by any person, which makes it ideal for treating overdose in people who have been prescribed opioid pain medication, methadone, and in people who use heroin and other opioids. Naloxone has no potential for abuse. Naloxone may be injected in the muscle, vein or under the skin or sprayed into the nose.