"i have secondary progressive ms and was prescribed 300mg 3 x per day for severe burning sensation. the first week was fantastic no discomfort which really helped with my ability to walk and energy levels. then gradually over a period of 2 weeks the pain returned. i was then upped to 1200mg per day with no improvement.  then upped gradually over a period of a year to 3600mg per day with absolutely no improvement of pain. 3 months ago i decided i was not going to take this drug any more as it was useless. after much reading i decided the best course was to taper off 300mg every week until i was on nothing.  i am now down to 600 mg per day and over the next two weeks plan to totally stop.  i have had no major side effects and still have pain."