I'm taking gabapentin 300mg three times a day. After about 5 days, I already notices I'm building a tolerance to it some, not too much though. I tried for a few years taking it every few days or so, so that I would not build a tolerance to it, but of course, you experience the withdrawal those few days of not taking it consistently. A lot of POSITIVE comments about it here. Most sites are all very very negative about it. I'd really like to see if anyone has been using it for anxiety for a long period, such as a year or more and say it still is working for them.