vedev - absolutely agree and this is something people need to know about naloxone (Narcan), is half life (how long it's effective at keeping someone out of an OD) can vary from a few minutes to a couple hours. Sometimes that's enough to keep them alive, quite often they'll need more as the naloxone "wears off" and the original OD opiate overpowers the diminishing naloxone.
This is especially true with long acting opioids, as should be obvious to the knowledgeable user, but folks that don't know naloxone well or how various opioids behave in the body need to know is that just getting someone out of an OD with naloxone doesn't guarantee survival, esp., with compounds like methadone or extended release formulations of short acting opioids, or massive short acting ODs.
Always call 911 and have proper medical supervision until the person is clear of all the original opioid that caused the OD.
People have died b/c hospitals discharged them while awake only to have them fall back out when the naloxone wears off. I know of one case for certain.
Naloxone + 911 saves lives. Naloxone reverses overdoses, but not always permanently, sometimes for just a short while, then more needs to be administered.
Thanks for the clarification.