The dosage of arimidex you are using is alright, but it would be much more beneficial and safe for you to use aromasin. Arimidex is not a suicide aromatase inhibitor, so it will leave the possibility of an estrogen rebound after you stop taking it. On the other hand, in the case of aromasin you get a suicide aromatase enzyme inhibitor, so there will be no estrogen rebounds with it. Besides, unlike arimidex it is much more beneficial for cholesterol levels, and aromasin will increase the IGF-1 levels by up to 25%, which is scientifically proven. You make the choice here.