Sorry to bump up an old topic but I thought I could add my few cents here.
Iboga eyedrops is actually something I'd like to try at some point. Sananga interests me but seems very hard to find so far, so since iboga is a relative to tabernamontana Undulata, I suspect that the active alkaloid is found in Iboga, maybe even in higher doses.
I clearly remember that after my first TA flood dose, my eyes could see really well without glasses. I was shocked at this. This went on for almost the entire duration of the afterglow until at one point I realised that the effect was gone. I am myself a bit short sighted. This made me believe that whatever is acting in Sananga may very well be present in Iboga, or at least a similarly acting compound.
My PlanStep 1) Take root bark and lemon juice and make a muddy mixture out of the root bark dust and lemon juice.
Why?
1) It seems to me that one important thing for the alkaloids to soak out of the plant is an acidic water. The amazon river is rich in tannic acid (ph 6-6.4), which I guess helps the extraction of whatever the active ingredient is.
2) Because over here lemon is used as an eye tonic as well. Lemon has citric acid (Ph 3) I would have opted for other acids otherwise, like white vinegar (acetic acid ph 3.5-5).
3) Alkaloid out if Iboga, as well as from other plants is extracted with an acidic solution. I am guessing (yes it's just a guess) that the active component that improves vision is a variant of Ibogaine. Ibogaine is NOT itself soluble in water but it may be possible that a variant of Ibogaine (or noribogaine, ibogamine, ibogaline....ect) present in the plant, soluble in water is what we are after for the Sananga effect.
4) Why make a mud? First of all to let a a higher concentration of acid act on the bark. Higher concentrations would make the end product burn the eyes for no real benefit. You just want to have enough acid concentration at this stage to draw the alkaloid out of the bark, react to the bark and the job is done. Any remaining acid will then be diluted in water.
5) last reason for why lemon. It's because I have a lemon tree and that makes lemons easily available

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Step 2) After letting it soak for about 4 hours hot water will be added to the solution. And let it soak there from 14 to 24 hours.
At this stage I really cannot determine how much root bark to add with how much water. I guess this will take a bit of trial and error. One really doesn't want the solution to have too much acid nor too much iboganoid. If the iboganoid (a term I'm using for the hypothetical, Ibogaine-like compound) if too concentrated it may over stimulate the nerves in the nostril causing the nose to believe it's detecting poison and this may result in anything from watering nose (one of the known effects of too much ibogaine) to nose bleeding; which is what the nose does if it thinks too much poison has been absorbed through it. It's an emergency clean up procedure but an unpleasant and unhealthy one.
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Step 3) Using a funnel and filter paper pour the liquid in a clean container. Pour slowly, making sure that no sold matter pases through. After that, you can hard press the paper with your hand to force more liquid out. Rinse with more lukewarm water and repeat, making sure not to break the filter paper.
Your Iboga eyedrop solution is now ready. You can sterilize it by heating close to boiling point or with colloidal silver.
The remaining solid matter still contains lots of alkaloids. You can dry it out (in the sun perhaps) and swallow it later. Since some alkaloids will already be out of the bark without the aid of your gastric fluids, this batch will likely act faster.
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I might have something more to add later on this. Depending on feedback.