Anastrozole
"Prescribed after Lumpectomy for breast cancer and taking this medication for 1 year, I've experienced extreme panic attacks, anxiety that often prevents me from wanting to leave the house, and insomnia. My symptoms were so severe, I could not function at work and took early retirement. I have discussed these side effects with my oncologist; his concern was more with flushing side effects than anxiety.  I have 4 more years of taking this medication and honestly don't know if I'll be able to keep it up. I find myself having extremely blue feelings and without taking anti anxiety meds I truly would not be able to function as all."