Fulvestrant is an antiestrogen 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 antiestrogen
medication.
Fulvestrant is not a chemotherapy drug.
Fulvestrant may also be used for other purposes not listed in this medication guide.