Hello @terrydclaar - I believe the Gabapentin did impact my memory and ability to think clearly. My circumstances were complicated by the fact that my brother died (Nov 15/19) not long after I started taking Gabapentin, so it was difficult to tell what was caused by the medication and what was grief-related. The one side effect that I was able to clearly identify as related to the Gabapentin was terrible, terrible dreams and thought processes (only at night). I spent a fair amount of time talking myself back into a state of calm in the middle of the night. I experimented with dosages and discovered the dreams weren't so bad at 200 mg/day - but that was not enough to manage the pain. And that's why my doctor switched me to Lyrica.