Ibogaine is effective in beating addiction when a flood dose is taken, which is a massive undertaking and something that must be planned very carefully and given a week or more of time (as the acute effects last 3 days and then there is a reintegration period). Don't try to take rootbark for a flood dose though. When I took lower doses, I found it would temporarily alleviate withdrawal symptoms for ~10-12 hours but there was no behavior-modifying effect. With the flood dose, I was cured of addiction I feel, in all honesty I have never had so much as a craving since (4.5 months ago), no PAWS, etc. It also realigned my life is a number of ways, and I am so much healthier and happier now. I can honestly look at my life as pre-ibogaine and post-ibogaine, that's how much change was initiated. But it took a flood dose to do that.
If you are interested in pursuing this you can PM me about it more because I have a lot of knowledge. I recommend a combination of pure ibogaine HCl and TA extract, so you get the whole alkaloid spectrum but don't get some of the nasty side-effects of pure rootbark.
I've never taken rootbark so I can't help you on dosages of that.