I took Arimidex for one year after my mastectomy (Dec '05) and chemo (finished treatment in April '06), and now I have osteoporosis in the spine ! My onc changed me to tamoxifen. Which is the better brand? I was given Genox from the pharmacy, but having read your comments about Nolvadex …maybe I should change. I am in Australia and we do have this product available. Any advice gratefully received !