Why has the United States approved the sale of Narcan without a prescription?

The US Food and Drug Administration has approved an over-the-counter version of Narcan, an antidote that rapidly reverses the effects of opioids and is the standard treatment for opioid overdose. Dr. Felipe Lobelo, from the Emory Diabetes Global Research Center, answers questions about this drug and the impact that its sale would have on society and drug use.