Raloxifene (Evista) is a relatively new selective estrogen receptor modulator (SERM) also referred by many as Anti Estrogen.
Evista works by binding to the estrogen receptors in the body, preventing estrogen from binding to these sites, it works much like Clomid™ and Nolvadex™ do, but in women has the advantage that of being an anti-estrogen also in the uterus, whereas clomiphene and tamoxifen are being estrogens and in these tissues.