Fulvestrant is available as an intramuscular (IM) injection.
How It Works
Fulvestrant is called an antiestrogen medicine. This means that it blocks the effect of estrogen in the body. It is only used for postmenopausal women who have been diagnosed with estrogen receptor-positive (ER+) breast cancer.
Why It Is Used
How Well It Works
Fulvestrant is as effective as aromatase inhibitors, such as anastrozole (Arimidex), in the treatment of women for metastatic breast cancer when other hormonal therapies, such as tamoxifen, have stopped working.1 It only works for postmenopausal women who have been diagnosed with estrogen receptor-positive (ER+) breast cancer.
Most women do not have problems with side effects while taking fulvestrant. When side effects happen, they are typically mild and may include:
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About
Do not take this medicine if you are or may be pregnant. Do not breast-feed while you are taking this medicine.
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