long term use of Celexa

I have been using generic Celexa (citolapram?) for about ten years for chronic pain.  It seems to work quite well but I worry about the long term effect on my brain and my liver ( or others I am unaware of).
I am prescribed  a standard dose (20mg) and keep trying to lower it.  I have gotten it down to 3/4 pill /day but when I go to 1/2 the neck pain seems to come back.  Should I keep trying?  My neurologist thinks I should stick with it since it took a long time to find something that would work.
{PLease give me your opinion on long term use of this drug.

Thanks, Lucinda

[MMahon]

Check out this link for info on Celexa.  Hope it helps.

http://health.yahoo.com/depression-medications/citalopram-oral/healthwise--d04332a1.html

There is always a balance when considering the long term effects of a drug vs. the long term effects of NOT taking it.  
Good luck