If you can get Ativan Sublingual 2mg, I think you'll find it as fast and effective for anxiety as 1mg of Xanax, though less "euphoric," which is why most Docs prefer Ativan. I haven't seen any OP's or IOP's that offer the SL form of Ativan, though. In ER once they gave Ativan to me IV with one of those little fixed dose - tape on styrettes (is that correct name?). It was very effective at reducing anxiety quickly. Those would be great, if you could buy them from an OP or IOP Both Ativan and Xanax have 1/2 lives of about 8-10 hours, if I recall correctly, so you can start getting some rebound anxiety after 4-5 hours. Klonopin has a 1/2 life of about 20 hours and, if you take it every night before going to bed, it never completely clears your system, so you don't get a rebound. If I'm flying somewhere, I'd wash down an Ativan or a Xanax with a drink in the bar before departure. Usually sleep for a good 4-5 hours on the plane -- I'm the one next to you snoring For overnite sleeping pill with no rebound anxiety next day, Klonopin is my benzo of choice.