I was on Arimidex for 2 years (same as Anastrozole) but they suddenly demanded an additional $5 on top of the PBS cost every time you filled a script - so I swapped to Anastrozole & I actually think IT was better for me than the Arimidex! I've been on it happily for for over 2 years now. Being nearly 70 - many of my side effects were already there even before I started on AIs (but Letrozole and Exemestane made them WAY WORSE) so happy with where I am now.
Once you START on one 'brand' - stick with it for at least 6 months as sometimes even the coating on the meds can give you side effects! grrrr Don't let them swap you around. Good luck
Even sleeping tablets like Temase (there is generic one of that too) but Temase will dissolve on your tongue with a bit of spit, making it easier to absorb quicker at 2am when you need it ...... whereas the generic ones (I forget the name) don't dissolve & take longer to absorb! I tried them once - but never again!