For some reason, I cannot get the story to come up. Can someone fill me in? I was just, today, changed from Neurontin to Topomax by me Neuroligist per my suggestion. after taking Neurontin for almost 2 years, I have been on my period for 4 months and gained a significant amount of weight over 6 weeks, so we a re hoping this medication may turn out to be more helpful.