TAMOXITECH is used to lower the chance of getting breast cancer in women with a higher than normal chance of getting breast cancer in the next 5 years (high-risk women) and to lower the chance of getting invasive (spreading) breast cancer in women who had surgery and radiation for ductal carcinoma in situ (DCIS). DCIS means the cancer is only inside the milk ducts. This medication can block the growth of breast cancer. It works by interfering with the effects of estrogen in the breast tissue. Swallow the tablet(s) whole, with water or another non-alcoholic liquid. You can take TAMOXITECH with or without food.