Exemestane
"My OC switched me from letrozole to exemestane because I was having some bone loss. I was a little more tired and achey on the Letrozole so assumed the same from exemesterane but oh my gosh what a difference. I gained 6Lbs in a month, horrible headaches, pins and needles in hands, back pain, fatigue, waking up in the middle of the night, hot flashes, ring in my ears and blurry vision.  I'm switching back to Lettozole at least the s/e are tolerable. I guess everyone is different if it works for others awesome but not for me. These reviews are so needed in our for-profit health-care system. Doctors  won't tell you or don't know about all the side effects and who even knows about long term ones....."