Celexa is an SSRI antidepressant, but it's also prescribed for anxiety disorders. It's in the same class of drugs as Prozac, Zoloft, Paxil. Since it's newer, it tends to have fewer side effects and less severe withdrawals than the other SSRIs, but some people still can't tolerate it.

It's hard to tell you much more information unless you have specific questions about it. What exactly do you want to know?