Writing in the medical journal Lancet Oncology, they said women who have a greater than 4% chance of developing breast cancer in the next 10 years should be offered preventative therapy.
Among the drugs they suggest is Tamoxifen, a medicine commonly used to combat breast cancer.
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Professor Jack Cuzick, an epidemiologist at Queen Mary, University of London, has estimated that for every 1000 patients using tamoxifen for ten years, there would be 20 fewer cases of breast cancer.
However long-term tamoxifen use has also been linked to womb cancer and deep vein thrombosis.
The experts liken prescribing tamoxifen to help prevent breast cancer to giving statins to patients at risk of heart disease.
"Cardiologists figured out a long time ago that you don't wait for someone to get a heart attack and treat it, you actually identify people of high risk and go about reducing that risk. And this is the same idea being applied now to cancers, specifically breast cancer," Professor Cuzick told the BBC.
