Narcan is an emergency drug used to reverse opioid intoxication during an overdose, and it comes in the form of a nasal spray. It binds to opioid receptors to block the effects of narcotics on the brain. Historically, Narcan has been used by paramedics and health workers and has only otherwise been available by prescription. Now, retailers have been permitted to sell Narcan (also known as naloxone) over the counter. Many people are asking, Is Narcan FDA approved? Who should get it?  Here’s what we know about federal approval and sales of Narcan over the counter.