|Trade names||Arimidex, others|
|By mouth (tablets)|
|Drug class||Aromatase inhibitor; Antiestrogen|
|Elimination half-life||46.8 hours|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||293.366 g/mol g·mol−1|
|3D model (JSmol)|
|(what is this?)|
Anastrozole, sold under the brand name Arimidex among others, is a medication used in addition to other treatments for breast cancer. Specifically it is used for hormone receptor-positive breast cancer. It has also been used to prevent breast cancer in those at high risk. It is taken by mouth.
Common side effects include hot flushes, altered mood, joint pain, and nausea. Severe side effects include an increased risk of heart disease and osteoporosis. Use during pregnancy is known to harm the baby. Anastrozole is in the aromatase-inhibiting family of medications. It works by blocking the creation of estrogen.
Anastrozole was patented in 1987 by ICI, and approved for medical use in 1995. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. Anastrozole is available as a generic medication. The wholesale cost in the developing world is about US$1.92–30.60 a month. In the United States the wholesale cost is about $3.81 per month. In 2016 it was the 224th most prescribed medication in the United States with more than 2 million prescriptions.
The ATAC trial was of localized breast cancer and women received either anastrozole, tamoxifen, or both for five years, followed by five years of follow-up. After more than 5 years the group that received anastrozole had better results than the tamoxifen group. The trial suggested that anastrozole is the preferred medical therapy for postmenopausal women with localized estrogen receptor (ER) positive breast cancer.
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