If I take naltrexone in evening and need medical attention 12 hours later for some reason would the naltrexone be out of my system or would pain killers not work for days after taking?
I have heard there is naltrexone bracelets maybe I should have one of those.

This is from the C Three Europe Website:

Naltrexone Half Life

Please would you confirm for the readers what Naltrexone’s half life actually is, what this means and why it is important?

Dr E: The plasma half-life of naltrexone is about 4 h, and for its active metabolite 6-β-naltrexol it is 13 h.

Therefore one 50 mg tablet of naltrexone blocks opiates and endorphins for at least 24 hours.

I carry a medical card in my wallet that had all my meds on it and Identifies me as type 2 diabetic.

There are free websites for this.