I've been on gabapentin about 6 months now at 2,400mg per day..divided. It's not as potent as it was when i first started taking it. I always take two at once (2 800mg) when i go somewhere where I will feel uncomfortable. And even then, it's nowhere near as potent as it was when i began. Is there any long time users here that can say it's still very effective? Maybe it has a curve where it settles down and remains at a constant. Please let me know. I depend on this so much for my anxiety and depression. I've tried everything under the sun for almost 50 years and this is the ONLY thing that has helped.