Mifepristone Anti Estrogen Steroids Anastrozole / Arimidex Powder CAS 120511-73-1 Arimidex is a drug used to treat breast cancer in post-menopausal women (women who have gone through the menopause/ change of life). It is a type of hormone treatment known as an aromatase inhibitor. The female hormone oestrogen stimulates some breast cancers to grow. These are described as hormone sensitive …