Letrozole

Generic name: letrozole [ LET-roe-zol ]
Brand name: Femara
Dosage form: oral tablet (2.5 mg)
Drug classes:Aromatase inhibitors, Hormones / antineoplastics

Medically reviewed by Drugs.com on May 4, 2022. Written by Cerner Multum.

What is letrozole?

Letrozole lowers estrogen levels in postmenopausal women, which may slow the growth of certain types of breast tumors that need estrogen to grow in the body.

Letrozole is used to treat breast cancer in postmenopausal women. It is often given to women who have been taking tamoxifen (Nolvadex, Soltamox) for 5 years.

Letrozole may also be used for purposes not listed in this medication guide.

Warnings

You should not use letrozole if you are pregnant.

Before taking this medicine

You should not use letrozole if you are allergic to it.

letrozole is for use only in women who can no longer get pregnant. Letrozole can harm an unborn baby. Do not use if you are pregnant. Use effective birth control if you are not past menopause. Keep using birth control for at least 3 weeks after your last dose of letrozole. Tell your doctor if you think you may be pregnant.

Tell your doctor if you have ever had:

• liver disease (especially cirrhosis);

• osteoporosis, osteopenia (low bone mineral density);

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