I believe there very well could be a rebound for someone on long term arimidex treatment. But how significant is the effect? Who knows, probably not too bad though, just a guess. I would follow the docs advice and get blood work in 4 weeks. If the changes are good then keep with it. If not then make adjustments as needed.

But too often I see people take too much, then then take too little, then too much. Meanwhile, they are going months between lab work and switching from high doses to none and wasting their own time and effort. They, often, would have been better off by making smaller adjustments and getting more frequent bloodwork.

But the quick-fix mentality is seductive... so many fall victim to it.