Welcome to Healing Well and the A & P forum. I will try to answer your question but my info may be different from another member and I am not a professional. :)
From what I have read Paxil may be the most notorious of the SSRI's to cause weight gain. Celexa was possibly the least likely to cause large weight gains.
This is a good subject to discuss with your physician and analyze how well your medication is working versus the down side of being overweight which is not good for your health either.
Again, a Warm Welcome and stay with us.