A previous clinical trial found that tamoxifen, taken for five years, reduced the risk of developing invasive breast cancer by about 50% in post-menopausal women who were at increased risk of getting the disease.
Another trial found that five years of raloxifene reduces breast cancer risk in such women by about 38%.
Under the new plans, high risk post-menopausal women could be offered the drugs for a period of five years unless they have a history of thromboembolic disease or endometrial cancer.
More top news
The 20-year-old US reality star is reportedly expecting her first child with rapper Travis Scott.
Save Your Uber in London was set up after it was announced the firm would not have its licence renewed when it expires next week.
After a damp morning it will brighten up in the south and northeast but will remain cloudy in northwest England and southern Scotland.