My familiarity with galantamine is quite limited, but as far as I know there is nothing in the literature which states that it causes brain damage at recommended dosages, quite the contrary actually, there are many references in the literature which show that galantamine has a very positive effect on damaged brain cells.
“The most compelling insight of that day was that this awesome recall had been brought about by a fraction of a gram of a white solid, but that in no way whatsoever could it be argued that these memories had been contained within the white solid. Everything I had recognized came from the depths of my memory and my psyche. I understood that our entire universe is contained in the mind and the spirit. We may choose not to find access to it, we may even deny its existence, but it is indeed there inside us, and there are chemicals that can catalyze its availability.”