Oh yeah be prepared for a shifting of cranial plates....
One of my personal group had this to say:
Iboga is a Teacher like no other. If you're keen to ceremony, do as much research as possible before. Have a sitter close by. If you have any health issues - weak heart etc, abstain. Keep your head still during the entirety of the experience: for +- 10 hours with a breakthrough dose. Don't walk around. Take a month off from the world. This is serious stuff. Remember to fast. Ceremony correctly & you may be in for a truly life-changing, insighful experience beyond anything you might have experienced before. Iboga is said to clear a life's worth of negative cellular-memories stored in the body ( be prepared to purge real good ). Low doses are used a stimulant apparently. I ate 40 capsulated root bark to break through. A friend ate 20 & didn't breakthrough, so that's a rough dose measure ( of course, apart from strength of alkaloid due to growth factors of the plant, etc ). I went through literally weeks of side-effects, so ( as a warning ) be sensible & careful with this plant ( IOW, respect it ! ) - my ' side-effects ' were major problems with equilibrium , intense migraine, physical shifting of the skull's bones..