Arimidex versus Tamoxifen

I started tamoxifen in August and have heard very positive things about Arimidex.  Should I switch now?

[CCF-RN,MSN-rf]

Dear redbean:  Arimidex is an aromatase inhibitor that has been approved by the FDA for first line use in hormone receptor-positive or hormone receptor- unknown locally advanced or metastatic breast cancer in post-menopausal women.  It is also approved as second line therapy to treat advanced breast cancer in post-menopausal women whose disease has progressed following treatment with another hormone therapy like tamoxifen.  It is not approved as adjuvant therapy or for use in premenopausal women.  Tamoxifen remains the treatment of choice in these situations.