Hi Linda My Rheumatologist put me on 4.5gr twice a day about a year ago before that I had tried many many types of meds and ended up high as a kite on 600mg of tramadol and that was just one of the med I had to take a day and that's no good as I could not function.
So about the Naltrexone I found that although they did not give me as much pain relief as other meds they did teach me to pace myself as my body would just stop and not let me battle on through the pain, as I used to on the opioids as they used to mask everything even my mind.
Unfortunately after a year on the Naltrexone the rheumatologist said I had to come off of them as there is a risk of sudden death because of the build up of toxins in the body(oh my god ) so on to yet another med this time trans patches, they were terrible made me sick and no good for the pain even when increased in strength.
So now after six months back on the Naltrexone after my body had a rest from them, am now waiting for Botox injections into my spine whatever next, mind you when you are in this much pain you will try any thing, my advise to you is, give it a go it may work for you and its got to be better than living in this hell.