alt Hacker NewsI can also confirm brain zaps both when I tapered down and if I missed a dose. It was unpleasant but I put up with it when reducing my dose. I changed from it because it caused insomnia as a side effect badly enough that it was worse than the problem.
My understanding (which may be incorrect, not a doctor) is that you need a higher dose to achieve the N part of the SNRI. I wonder if this somehow linked to the experience. On lower doses of SSRIs I never had any such experiences.
I would guess it has more to do with the serotonin, Atomoxetine has small S activity and large N activity and relatively it can be discontinued much easier than any of these other drugs.