I suffer from sever anxiety and panic attacks! I was originally prescribed Xanax up until 2 yrs ago because of my tolerance & the half life is very short! My doctor currently prescribes me 8mg a day of Klonopin which is an increase from 6 mg four weeks ago! I notice it's no longer working and my panic symptoms are reappearing even on it! I don't know if my tolerance went up but he increased it so it should work! I would rather go on Xanax again but I would have to take much more since it doesn't last as long! Anyone else having this problem?