My husband takes neurontin for neuropothy in his hands and feet (means the nerves are dying). It seems to help the pain, but I have noticed that he seems to drop off to sleep at any time of the day very easily. I thought this was from the meds. Also, as far as the weight gain, he has also been diagnosed with diabetes recently and had to go on an 1800 calorie diet. He has lost about 15 pounds this month alone, so I don't think that the neurontin is causing any weight problems.