Here is an article that goes into great detail on various formulations they used, and decided the principle is sound,
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4374332/
This one gets you up to date on transdermal advances for this kind of med.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5497436/
The short version seems to be, yes it will absorb through skin. The results seem good and a steady slow release can be achieved. The optimum formulation so far delivers 80% of the medication over 24 hours. So, if the gel contained 10 mg then 8 mg would be spread out over 24 hours, or roughly 2.6 mg over 8 hours. That is the best formulation so far. Anything you do at home is likely to be less.
In general, most simple gels will only get 10% of the drug into your blood over 8 hours, but the characteristics of the drug change that. It sounds like galantamine absorbs pretty well. My best guess is to assume 20% of your drug might be absorbed the way you are doing it. For starters I would use twice the dose you would take orally, and see how that goes. You probably need to wash the area with alcohol in the morning so you are not absorbing it all day too. Going up in strength until you get the dose you want based on results, you will likely end up finding out that almost 20 mg will be needed, but do not jump to that high of a level before trying 8 mg.
Disclaimer: This info is for theoretical educational purpose only. I do not encourage anyone to rely on my opinion when ingesting chemicals. Do so at your own risk. Good luck. If the raw chemical is not too expensive it could be a good project. Note: there are dangers involved with galantamine as with any real serious medication. I have never used it and in general think strong drugs like this are best to be avoided.
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