I took Neurontin with some other bipolar medication for such a short time that I'd rather not share my experience. I do recall taking over 1,000 mg per day. My husband, who does not have bipolar disorder, has taken the small dose of 200 mg per day (in the morning) for a couple years now. He takes it for a combo of anxiety and nerve pain. It is especially helpful for him for the nerve pain (peripheral neuropathy).