I actually sat down with my doctor just a few days ago and asked him the same exact question! I tried Celexa about a year and a half ago and it was the WORST two days of my life! I wanted to DIE!
However.. everyone reacts to meds differently.. lol
I have been on Lexapro for the past couple months and have been doing wonderfully. When I asked my doctor about Lexapro and Celexa, he explained to me that they were sister meds and were pretty much the same, except Celexa is a "rougher" form or Lexapro... for sure!
I just thought it was crazy how I reacted so differently to these two.. guess it just depends on your body!