The U.S. Preventive Services Task Force recommends against routine use of tamoxifen or raloxifene for the primary prevention of breast cancer in women at low or average risk for breast cancer.
U.S. Preventive Services Task Force. Breast Cancer: Medications for Risk Reduction recommendation statement [Internet]. 2013 Sep [cited 2014 Jan 8]. Available from: http://www.uspreventiveservicestaskforce.org/uspstf/uspsbrpv.htm