I just started Naltrexone last week and I feel very tired about two hours after taking it, and again the next day. Has anyone else experienced this and if so does it last?

I definitely had some strange side effects when I first started Naltrexone. I remember feeling a little spacey, dizzy and tired. These side effects resolved after a couple of weeks.

Welcome, Kikidebris!

It's fairly common to get side effects from Naltrexone and as per Deuce's experience, they typically pass in a few days to a couple of weeks. Here's a post at OSL that includes some tips about using Naltrexone and how to diffuse the side effects:

http://optionssavelives.freeforums.net/ ... hints-tips