Best of luck on the Exemestane! I started on Anastrozole, and it gave me some pretty bad ‘brain fog’ and memory issues. I’ve found a few articles on-line about low estrogen from these meds causing memory/cognitive function challenges. I had a similar issue with tomoxifin. I’m now on Exemestane and it’s not perfect, but it’s better for me than Anastrozole or Tomoxifin. Do some research on line for yourself and your individual situation. For me, it’s been a trial and error process. Personally, I don't think any of these drugs are perfect, they all have side effects, but it’s certainly better than a return of cancer!