Hi Riya,
I just started exjade two months ago. So far my creatinine levels have remained stable, although I have been feeling some tenderness in my lower back (not sure why). I have been told that this isn't a side effect of the medication though. My ferritin has gone down about 200 ng since then, i.e. on average, 100 ng/month.
I think most people respond well to the medication, but you should definitely get a CMP every two months or so just to check that your creatinine levels aren't rising, and even get a urine test at the same time to check that you don't have any proteinuria. These are both early indicators of kidney problems. Hope this helps.
-David