Walgreens To Begin Selling Opioid Overdose Reversal Drug Posted on October 26, 2017 by Chicago 1 Chicago Chicago News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: Naloxone, also known as Narcan, is a medicine that can reverse the effects of an overdose from opioid drugs or heroin within seconds. CBS 2’s Charlie De Mar reports. 1 Chicago Chicago News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: