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Fulvestrant (Faslodex)

Find out what fulvestrant is, how you have it and other important information about taking fulvestrant for advanced breast cancer.

Fulvestrant (pronounced full-vest-rant) is also called Faslodex. It is a hormone treatment for post menopausal women with advanced beast cancer.

How fulvestrant works

The female sex hormones oestrogen and progestrone stimulate some breast cancers to grow. These breast cancers are called hormone sensitive or hormone receptor positive.

Drugs that block the effects of these hormones can slow or stop the growth of breast cancer cells.

Fulvestrant stops oestrogen getting to the cancer cells by blocking oestrogen receptors and reducing the number of receptors the cancer cells have.  

How you have fulvestrant

You have fulvestrant as two injections – one into each buttock. You can have it at your GP surgery. Your doctor or practice nurse gives you the injections.

You have the injections every 2 weeks for the first 3 doses and then monthly. They each take 1 to 2 minutes.

Tests during treatment

You might have blood tests before starting treatment and during your treatment. They check your general health and might check your levels of blood cells and other substances in the blood.

Side effects

Important information

Other medicines, food and drink

Cancer drugs can interact with some other medicines and herbal products. Tell your doctor or pharmacist about any medicines you are taking. This includes vitamins, herbal supplements and over the counter remedies.


This drug contains small amounts of alcohol. This is not harmful to most people but may be if you have alcohol problems.

Treatment for other conditions

Always tell other doctors, nurses, pharmacists or dentists that you’re having this treatment if you need treatment for anything else, including teeth problems.

More information about this treatment

For further information about this treatment go to the electronic Medicines Compendium (eMC) website.

You can report any side effect you have to the Medicines Health and Regulatory Authority (MHRA) as part of their Yellow Card Scheme.

Information and help

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About Cancer generously supported by Dangoor Education since 2010.