Klonopin
"I've tried, quite literally, every medication there is for panic disorder and Klonopin is the only one that works for me.  After being confined to just two rooms in my house for a year (yes... I was scared to go into the other rooms), I'm now able to go outside and even drive up to twenty miles from my house without a "support person" (three years later).  My first panic attack was while driving and I totaled a car, so this has been a MAJOR improvement for me. I am prescribed 2mgs three times daily but only take 500mcgs as needed, unless I'm having a rush of panic attacks and need to take it preemptively for a few days, because I don't want to develop a low level tolerance.  It's given me my life back."