Nolvadex 10mg 50 tabs is a medication used to treat breast cancer. It is an anti-estrogen tablet prescribed to women to block the effects of estrogen. Nolvadex is used in the treatment of metastatic breast cancer, and it may help to reduce the size of tumors. This medication works by decreasing the amount of estrogen in the body, which can slow the growth of certain types of cancer cells. Nolvadex is taken by mouth, typically once or twice a day, or as prescribed by your healthcare provider.