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A 25-year-old member asked:

What is the difference between femara (letrozole) and arimidex?

2 doctor answers4 doctors weighed in
Dr. Cayce Jehaimi
Pediatric Endocrinology 21 years experience
Both AI: Femara (letrozole) is letrazole, an aromatase inhibitor that is slightly more potent than Arimidex though belong to the same class of drugs.
Dr. Andrew Turrisi
Radiation Oncology 47 years experience
Both interfere with : Estrogen production and are used in treatment of breast cancer where the primary was er+. Side effects are similar, cost is much higher fro Letrozole (femara). It is newer. These are each used only in postmenopausal patients. Tamoxifen around for decades is used in premenopausal.

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A 30-year-old member asked:

What are differences between femara (letrozole) and arimidex ?

1 doctor answer5 doctors weighed in
Dr. Devon Webster
Medical Oncology 22 years experience
The names and doses: Femara (letrozole) and Arimidex are both aromatase inhibitors that are taken by mouth once a day. They work by prevenitg fat cells from making estrogen, which lowers total estrogen in your body. We use them identically in practice.
Dr. Andrew Turrisi
Radiation Oncology 47 years experience
And price!
Aug 17, 2012
A 53-year-old member asked:

What's the difference between arimidex and femara (letrozole)?

3 doctor answers5 doctors weighed in
Dr. Barry Rosen
General Surgery 34 years experience
Very little: Both of these drugs are aromatase inhibitors and are used to treat post-menopausal hormone-sensitive breast cancer patients. Their chemical structure is remarkably similar. No study has ever compared these two drugs "head-to-head", so it is hard to recommend one over the other. If one of my patient's side effects are so severe that they are contemplating stopping the med, i switch to another.

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Last updated Dec 14, 2018
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