@sue4 No Low Dosage Naltrexone is not an opioid. It is actually used to get people off of opiiods. Also it is a much lower dosage than the one used for opioid addiction. The Western Neuropathy Association in Auburn , CA, did a webinar on this drug. Maybe if you contact them, they can connect you to this webinar. I think it doesn't get much attention because it is not a drug big Pharma make any money from as it a compounded generic drug. Good luck. I have o side effects at all...you start on a two week very low dose and then it is a little higher..I take 3.5 mg