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What Is Faslodex?

Faslodex is the brand name for fulvestrant, a medicine used to treat certain hormone receptor-positive advanced breast cancers. It blocks and reduces estrogen receptors in cancer cells. A healthcare professional gives it as injections into the muscles of the buttocks.

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What Is Faslodex?

Faslodex is the brand name for fulvestrant, a medicine used to treat certain hormone receptor-positive advanced breast cancers. It blocks and reduces estrogen receptors in cancer cells. A healthcare professional gives it as injections into the muscles of the buttocks.

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What Is Faslodex Used For?

Faslodex treats certain advanced or metastatic hormone receptor-positive breast cancers. It can be used alone for eligible postmenopausal women or with specific cancer medicines in other circumstances. The treatment choice depends on prior therapy and the cancer's test results.

How Does Faslodex Work?

Some breast cancers use estrogen signals to support their growth. Fulvestrant binds to estrogen receptors and leads to their breakdown. Reducing these receptors limits the signals available to hormone receptor-positive cancer cells.

How Is Faslodex Given?

A healthcare professional injects Faslodex into the muscles of the buttocks. The usual 500 mg dose is given as two injections, one on each side. Doses are scheduled at the start of treatment, two and four weeks later, and monthly afterward.

What Are the Side Effects and Precautions?

Injection site pain, nausea, joint or bone pain, fatigue, and hot flashes can occur. The medicine can affect liver test results, and injection near a nerve can cause pain or nerve injury. Faslodex can harm a fetus, so pregnancy precautions need discussion before treatment.

Frequently Asked Questions About Faslodex

Is Faslodex a pill?

No. A healthcare professional gives it by intramuscular injection.

Can Faslodex be used with another cancer medicine?

Yes. For certain patients, it is used with a medicine such as palbociclib, abemaciclib, or ribociclib.

Does Faslodex treat every type of breast cancer?

No. Its approved uses involve specific hormone receptor-positive advanced breast cancers. Tumor test results help determine whether it is suitable.

Can Faslodex be used during pregnancy?

It can harm a developing fetus. Patients who can become pregnant should discuss testing and contraception with their cancer care team.

References

Definition of fulvestrant - NCI Drug Dictionary. National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-drug/def/fulvestrant. Date Accessed October 6, 2026.

FASLODEX- fulvestrant injection. DailyMed (National Library of Medicine). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?audience=consumer&setid=83d7a440-e904-4e36-afb5-cb02b1c919f7. Date Accessed October 6, 2026.

Fulvestrant. National Cancer Institute. https://www.cancer.gov/about-cancer/treatment/drugs/fulvestrant. Date Accessed October 6, 2026.

Fulvestrant (intramuscular route) - Side effects & uses. Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/fulvestrant-intramuscular-route/description/drg-20063966. Date Accessed October 6, 2026.

Fulvestrant Injection. MedlinePlus. https://medlineplus.gov/druginfo/meds/a607031.html. Date Accessed October 6, 2026.