I was taking 1200 mg of gabapentin for bi polar a couple of years and had side effects of sominence, periferal edema, unbalance, fuzziness between me and reality, loss of memory, shankiness in my hands. I know this sounds bad, but it stopped my anxiety, random talk in my had, I was able to relax more.
My doctor was ignorant of the side effects of this drug so I had to educate myself and take action. I reduced the mg to 600mg per day. 300mg morning and 300mg night and the side effects have lessened. I feel much better. I think each person reacts differently to medications and the patient has to be the final arbitor.