"i&#039;ve tried everything for anxiety - which is severe all the time. xanax works! only issue is the length of time it lasts; i can feel the effects almost immediately (within 20 minutes and continue to feel effects kicking in for a good hour after), but after about 3 hours, i start to have rebound anxiety from it wearing off. be careful of tolerance though. since i&#039;ve been on it, i&#039;ve had to increase 4x. i started of with 0.5mg 3x/day and am now on 1mg, 5x/day. i don&#039;t want to change that, but this seems to be a perfect. it gives me the relief i need as often as my body seems to need it. i am so grateful for this drug, as my panic is non-existent, where it hasn&#039;t been in years. it&#039;s been non stop - never relief. i finally feel relief."