Femara
Femara (letrozole) is an aromatase inhibitor prescribed primarily to treat hormone receptor-positive breast cancer in postmenopausal women. By blocking estrogen production, it helps slow or stop the growth of estrogen-dependent cancer cells. It may also be used in fertility treatments to induce ovulation.
Femara is an oral hormone therapy for postmenopausal women with estrogen-sensitive breast cancer that works by reducing estrogen levels in the body.
Key facts at a glance
- RxNorm
- 203769
- Generic
- Femara
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Femara is primarily used to treat early and advanced hormone receptor-positive breast cancer in postmenopausal women. It is also sometimes prescribed off-label for infertility treatment to stimulate ovulation.
Femara belongs to a class of drugs called nonsteroidal aromatase inhibitors. It works by blocking the aromatase enzyme, which is responsible for converting androgens into estrogens. By reducing estrogen production, it deprives estrogen-sensitive tumors of the hormone they need to grow.
Common side effects may include hot flashes, joint pain, fatigue, and bone thinning. Regular monitoring and follow-up with a healthcare provider is essential during treatment. Women of childbearing potential should use effective contraception during treatment. May interact with other medications, so disclose all current medications to your doctor.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy