I had hair loss after lumpectomy and radiation and after starting on Evista for post breast cancer therapy. I blamed it on radiation, but could have been the Evista. Dermatologist prescribed 25,000 mcg of biotin daily. After about six months, hair started coming in thicker. Good luck -- sorta adds insult to injury, doesn't it? I'm at the osteoporosis site looking for answers about the possibility of Evista causing severe muscle spasms.