Never has been proven it was caused by
Femara, but better safe than sorry. Because of my risk
for clots, Tamoxifen would not be a choice
for me. I have only been on Aromasin for about two weeks, so I can't really give you an accurate evaluation of it just yet. One of my doctors told me you can't really tell if any of these drugs are working, however, until you've taken them at least three months.