--that one of the more common side effects of gabapentin is trouble with memory, and overall slowing of neural function (which, as an antiepileptic, is why it is often used for neuropathy in the first place; it helps to calm runaway or inappropriate neural signaling out of proportion to actual stimuli).

And that side effect may be hard to distinguish from memory issues that existed before it was taken, and may exacerbate them.

If you do think about weaning off gabapentin, though, go very, VERY slowly. Often, dropping it 100mg/week is cited, to give the body time to adjust the up-regulatory effects that using these medications tend to produce, and to prevent rebound neural pain or even the possibility of seizures (the body tends to try to increase neural signaling in response to the medication's dampening effect, so removing it all at once can lead to runaway signaling).