Letrozole Femara Anti Estrogen Steroid Hormone for Breast Cancer Letrozol

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1. OverView:
Letrozole is an oral, anti-estrogen drug that is used for treating postmenopausal women with breast cancer. The growth of some breast cancers in postmenopausal women is promoted by estrogens that circulate in the blood, and the adrenal glands are the main source of these circulating estrogens. Letrozole inhibits the enzyme in the adrenal glands (aromatase) that produces the estrogens, estradiol and estrone. Letrozole was approved by the FDA in 1997.

2. Why is this medication prescribed:
Letrozole is used treat early breast cancer in women who have experienced menopause (change of life; end of monthly menstrual periods) and who have had other treatments, such as radiation or surgery to remove the tumor. It is also used to treat early breast cancer in women who have experienced menopause and who have already been treated with a medication called tamoxifen (Nolvadex) for 5 years. Letrozole is also used in women who have experienced menopause as a first treatment of breast cancer that has spread within the breast or to other areas of the body or in women whose breast cancer has worsened while they were taking tamoxifen. Letrozole is in a class of medications called nonsteroidal aromatase inhibitors. It works by decreasing the amount of estrogen produced by the body. This can slow or stop the growth of some types of breast cancer cells that need estrogen to grow.

3. Letrozole dosing information:

(1) Usual Adult Dose for Breast Cancer:

For use as first-line treatment of postmenopausal women with hormone receptor positive or hormone receptor unknown locally advanced or metastatic breast cancer. Letrozole is also indicated for the treatment of advanced breast cancer in postmenopausal women with disease progression following antiestrogen therapy: 2.5 mg tablet orally administered once a day without regard to meals.

In patients with advanced disease, letrozole therapy should continue until tumor progression is evident.

(2) Usual Adult Dose for Breast Cancer -- Adjuvant:

For use as extended adjuvant treatment of early breast cancer in postmenopausal women who have received 5 years of adjuvant tamoxifen therapy: 2.5 mg tablet orally administered once a day without regard to meals.

The optimal duration of treatment with letrozole is not known. Treatment should be discontinued if there is a tumor relapse.

4. Proper storage of letrozole:
Store letrozole at 77 degrees F (25 degrees C). Brief storage at temperatures between 59 and 86 degrees F (15 and 30 degrees C) is permitted. Store away from heat, moisture, and light. Do not store in the bathroom. Keep letrozole out of the reach of children and away from pets.

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