Faslodex
Faslodex (fulvestrant) is a hormone therapy medication used to treat certain types of breast cancer in postmenopausal women. It works by blocking and degrading estrogen receptors on cancer cells, preventing hormones from fueling cancer growth. This medication is typically prescribed when breast cancer has progressed after other hormonal therapies.
Faslodex is an injectable hormone therapy for postmenopausal women with hormone receptor-positive advanced breast cancer that has stopped responding to other hormonal treatments.
Key facts at a glance
- RxNorm
- 203870
- Generic
- Faslodex
- 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.
Faslodex is prescribed for postmenopausal women with hormone receptor-positive (HR+) advanced breast cancer. It is used when the cancer has progressed or returned after treatment with anti-estrogen therapies such as tamoxifen or aromatase inhibitors.
Faslodex is a selective estrogen receptor degrader (SERD). It binds tightly to estrogen receptors on cancer cells, causing them to be broken down and destroyed. This blocks estrogen from attaching to the receptors and stops the signaling that promotes cancer cell growth.
Faslodex is administered as an intramuscular injection, typically once a month. Common side effects may include hot flashes, joint pain, nausea, and injection site reactions. Patients should inform their healthcare provider about all other medications and liver conditions before starting treatment.
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