About Tamoxifen

Cancer Types - About Tamoxifen

What is tamoxifen?

Tamoxifen is a drug that reduces and/or stops the effects of estrogen (a female hormone) in the body. It was developed over 30 years ago and has been used to treat both advanced and early stage breast cancer. More recently, tamoxifen is being used as an adjuvant, or additional, therapy following primary treatment for early stage breast cancer. It is also used to try to prevent breast cancer in women who are at high risk.

Tamoxifen is taken by mouth in tablet form and is usually prescribed as a single daily dose.

How is tamoxifen used for breast cancer treatment?

As a breast cancer therapy, tamoxifen works against the effects of estrogen, which has been shown to promote the growth of breast cancer cells. It is often called an anti-estrogen:

Additional benefits of tamoxifen

While tamoxifen acts against the effects of estrogen in breast tissue, it acts like estrogen in other body systems. According to the National Cancer Institute, women who take tamoxifen may experience many of the beneficial effects of menopausal estrogen replacement therapy, such as a lowering of blood cholesterol and a slowing of bone loss (osteoporosis).

Q: Do the benefits of tamoxifen in treating breast cancer outweigh its risks?

A: The National Cancer Institute states: "The benefits of tamoxifen as a treatment for breast cancer are firmly established and far outweigh the potential risks. Patients who are concerned about the risks and benefits of tamoxifen or any other medications are encouraged to discuss these concerns with their doctor."

What are the possible side effects of tamoxifen?

Women considering taking tamoxifen should consult their physician. Different women experience side effects differently. Some of the more common side effects may include:

Less common side effects may include:

Some doctors and researchers caution, however, that tamoxifen therapy may not be appropriate for all women who are at increased risk for breast cancer. Consult your doctor for more information regarding your individual case.

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