This is interesting... i did a year long research study with this drug added to percocet (i normally take Vicodin). I had a horrible accident years ago which resulted in a condition called "traumatic spondylolisthesis"... and my pain mgmt Doc asked me (because he knows that i hate taking narcotics...but can't stand upright without them) if i would like to do this study... where the naltrexone hinders someone from using pain medication in an unauthorized manner (crushing or whatever else they do).
The study was intended to reduce the street sales and abuse of narcotics. The naltrexone renders the narcotic useless if tampered with.
I had some horrible side effects... which i attributed to the percocet... but now i am realizing that it was most likely the naltrexone (which i thought was a harmless additive... silly me).
*I just looked up symptoms in case anyone may find this helpful (knowing what may happen ahead of time).
www.webmd.com/drugs/2/drug-7399/naltrexone-oral/details#side-effects