Two suggestions for you. First, that you should check with your physician regarding how they want to taper you off. Second, you will probably get a better response to this post if you list it under the "Medications and Therapy" section of the forum.
I do know that most psychiatrists/physicians want their patients to be on an anti-depressant for a minimum of one year. Oh, and I am on Celexa also, but have only been on it for six weeks now.
The best to you, CTC!... Chuck