... But what if the pain victim is unable to communicate ...
Bracelets / pendants / wallet-cards are available to quickly communicate medical information to doctors if the person is unconscious , e.g MedicAlert , (other brands are available).
Quote from: Pseudoscience-is-malarkey
Q. Should I fear opiate blockers?
You should be concerned about opiate "abuse", as it can be fatal.
People develop tolerance, increasing the dose to get the same effect , eventually leading to fatal doses : they stop breathing ... https://en.wikipedia.org/wiki/%CE%9C-opioid_receptor#Tolerance_and_overdoses
... opiate based drugs or alcohol...
There is synergistic effect if alcohol & opiates are combined ... http://www.ncbi.nlm.nih.gov/pubmed/2821747
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