Ibogaine is a hallucinogen. It mightn't be addictive in and of itself, but it definitely has a potential for abuse (and psychological dependence, just like marijuana and LSD do despite not being physically addictive).
Also, it's not exactly safe--Wikipedia lists twelve deaths due to ibogaine--which isn't a lot, granted; way more people die from normal doses of Tylenol (but way more people take Tylenol, too)... But it does mean this is something to be approached with caution. (Oh, and it's illegal in many places.)
There are already anti-addiction drugs on the market, like this one:
Wikipedia page:
http://en.wikipedia.org/wiki/Naltrexone
Description (by brand name Revia)
http://www.rxlist.com/cgi/generic/naltrexone.htm
Opioid antagonist--used for treatment of addiction, especially alcohol, heroin, morphine, etc. Stops the effects of the drugs but doesn't stop cravings; so it's mostly physical. It's used for rapid detox, too. Addicts probably need counseling and family (or other social) support to quit altogether. And whatever caused the addiction in the same place--whatever function the addiction served--needs to be dealt with, too. People don't take mind-altering substances for no reason.
I know about this because it was given to me for self-injury. It didn't help--probably because I don't get a positive "rush" from SI. Thankfully I know better now than to take six different psychotropics at the same time, as I was then, because I was positively miserable thanks to the side-effects--which meant I hurt myself a great deal more, not less.
Umm... Point being: If you want to stop an addiction, finding a medical cure isn't really useful for much more than detox and blocking the highs. There's a reason you needed to take whatever drug you were taking, and if you don't solve that problem, you'll just go on to something else.