Naloxone is an over the counter opioid antidote..

[Nighthawk61]

FDA News Release (Food and Drug Administration)
FDA moves quickly to approve easy-to-use nasal spray to treat opioid overdose
Naloxone in nasal spray form provides important new alternative for family members, first responders.

[Nighthawk61]

Drug overdose deaths, driven largely by prescription drug overdoses, are now the leading cause of injury death in the United States – surpassing motor vehicle crashes. READ MORE

http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm473505.htm