Fareston will display both estrogen antagonist / agonist properties in the body. This puts Fareston in the same category as Nolvadex and Clomid, the two most popular drugs in Farestons category. FARESTON is an estrogen agonist/antagonist indicated for the treatment of metastatic breast cancer in postmenopausal women with estrogen-receptor positive or unknown tumors. Toremifene administration for a period of 3 …