Fulvestrant is an anti-estrogen medication. It works by blocking the actions of estrogen in the body. Certain types of breast cancer use estrogen to grow and multiply in the body. Fulvestrant is used to treat some hormone-related breast cancer. Fulvestrant is also used in postmenopausal women whose breast cancer has progressed after treatment with other anti-estrogen medication. Fulvestrant may also be used for purposes not listed in this medication guide.
Fulvestrant is an estrogen receptor antagonist that is used to treat advanced breast cancer in those who have already undergone menopause. The breast cancer is a hormone receptor positive meaning that it relies on hormones such as estrogen to develop. Therefore, Fulvestrant is used to treat individuals whose breast cancer has deteriorated after undergoing treatment using anti estrogen drugs such as tamoxifen (Nolvadex).