Not Celexa, but I've taken Lexapro, which is very similar. Really, it had no effect for me, good or bad. It was like not being on meds at all. But that was back before they knew I had Bipolar; they were treating me for unipolar depression, and that wasn't my problem. I needed a mood stabilizer, not an antidepressant.
Celexa is an antidepressant, and antidepressants are rarely prescribed alone for Bipolar Disorder. Coupled with a mood stabilizer, it may work. Maybe if they tried Lexapro and Lithium for me (like they're trying Pristiq/Lithium), it would have worked, but I was long off of Lexapro by the time I was diagnosed with Bipolar.
While Lexapro didn't work for me, Celexa may be your miracle pill. Like I said, antidepressants are hardly diagnosed alone for Bipolar, but it all depends on your situation and you should listen to your doctor's advice. It may work very well for you. I'm pretty sure it's just my body chemistry (and the fact that I was being treated for unipolar depression) that is the reason Lexapro didn't work for me, as it didn't work for my sister either, and for obvious reasons our genetic makeup is similar.
I wish you the best of luck! If your doctor thinks Celexa is the best for you, definitely give it a shot. Just be aware that antidepressants prescribed alone for Bipolar Disorder may spark hypomania or mania. Be aware of your mood and report any signs.