Mjay, I’m so sorry that Armidex (Anastrozole is the generic name), caused memory loss/brain fog. I started off with anastrozole as my first AI after surgery and radiation. I has horrible memory loss/brain fog while taking that also. I thought I was sliding into dementia at 64 years of age. I was really frightened by that side affect. Plus my husband would make fun of me for not being able to remember the simplest things. It was AWFUL!! It was this web site when I started reading it, that tipped me off to the possibility that it was the meds causing brain fog, not any problem with my brain itself. My doctor switched my meds. and the brain fog went away. I’m currently taking Exemestane and that’s better for me-but not like the good old days before breast cancer reared it’s ugly head in my life. I so grateful for reading other women’s symptoms, problems, and issues that they have had through this journey. Thank you to each of you posting on this sight!! I don’t know what I’d do without each of you!