Cellcept was the miracle drug that put my Lupus into a "quiet" mode (they don't say "remission" for auto-immune diseases).
My dosage was increased up over time to a max of 2000 mg daily.
With auto-immune diseases, different medications work for different people, and they don't really know why. The 3 meds that are mix-n-match, trial-n-error are Imuran, Cellcept, and MTX. Imuran did nothing for me, but Cellcept was definitely a MIRACLE in my case. It does take a while to work.
I would follow my rheumy's instructions, sounds like you are on the right track.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde