Aromatase Inhibitors: Personalized dosing?

[Teal55]

Hi Ladies,

I was on ARIMIDEX for 6 months but had to stop last week due to side effects. My onco wants to switch to AROMASIN but I am holding off until I get a second opinion. I'm wondering if anyone of you know if these drugs are every compounded on an individual basis. I don't think I am able to tolerate the "standard dosage." Has anyone seen any studies that pertain to how the dosage is determined? Can you please share your experience regarding switching from one Aromatase to another. Arimidex to Aromasin
I don't understand how "one side pill" fits everyone? I am slender 118 lbs and finding it difficult to tolerate Arimidex. I'm scarred to try the steroid Aromasin. Please share your experience and any research you've come across.
How are dosages determined for patients?