FDA approves over-the-counter Narcan. Here’s what it means

The U.S. Food and Drug Administration on Wednesday approved selling the leading version of naloxone without a prescription, setting the overdose-reversing drug on course to become the first opioid treatment drug to be sold over the counter.

It’s a move that some advocates have long sought as a way to improve access to a life-saving drug, though the exact impact will not be clear immediately.

Here’s a look at the issues involved.

WHAT IS NARCAN?

The approved nasal spray from…