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1 box contains 30tabs.Each tab contains 20mg tamoxifen.Tamoxifen is an anti-estrogen that prevents the effects of estrogens on tissues. The precise mechanism of its action is unknown, but one possibility is that it binds and blocks estrogen receptors on the surface of cells, preventing estrogens from binding and activating the cell. It is used in patients for treating and preventing breast canser. Tamoxifen was approved by the FDA in December 1997.