FAQs About ARIMIDEX

If you are fighting early breast cancer, you may have many questions about treatment with ARIMIDEX. While you'll find answers to some of those questions here, the best way to get the information you need is to speak directly to your doctor. Together, you and your doctor can decide upon a course of treatment that is right for you.

Frequently asked questions for patients considering ARIMIDEX

Should I take ARIMIDEX for my early breast cancer?

If you are postmenopausal and have been diagnosed with hormone receptor-positive early breast cancer, and have recently undergone surgery with radiation, and/or chemotherapy, ARIMIDEX may be right for you. Discuss all your treatment options with your doctor.

What are the most common side effects of ARIMIDEX?

In the early breast cancer clinical trial, the most common side effects seen with ARIMIDEX included hot flashes, joint symptoms (including arthritis and arthralgia), weakness, mood changes, pain, back pain, sore throat, nausea and vomiting, rash, depression, high blood pressure, osteoporosis, fractures,* swelling of arms/legs, insomnia, and headache.

*Fractures (including fractures of the spine, hip, and wrist) occurred more frequently with ARIMIDEX than with tamoxifen (10% vs 7%).


You should also know that

  • You should speak with your doctor about any bone tests needed to determine your risk for osteoporosis
  • ARIMIDEX should not be taken with tamoxifen or with estrogen-containing therapies

Find out more about possible side effects of ARIMIDEX

Get tips on coping with side effects

Who should not take ARIMIDEX?

Do not take ARIMIDEX if you

  • Are pregnant, think you may be pregnant, or plan to get pregnant
  • Have not finished menopause (are premenopausal)
  • Are allergic to any of the ingredients in ARIMIDEX. See the full Prescribing Information for a complete list
  • Are a child

Is ARIMIDEX a type of cytotoxic chemotherapy?

ARIMIDEX is a hormonal treatment (also called hormonal therapy), not a cytotoxic chemotherapy. It works by reducing the amount of estrogen produced by your body. For more details, see how ARIMIDEX works

Frequently asked questions for patients taking or about to start taking ARIMIDEX

How do I take ARIMIDEX?

The dose for ARIMIDEX is one small tablet that you swallow once a day. Take ARIMIDEX exactly as prescribed by your doctor.


If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose. Take your next regularly scheduled dose. Learn more about taking ARIMIDEX and get tips for remembering to take your medication

How long should I take ARIMIDEX?

Take ARIMIDEX until your doctor tells you to stop. Participants in the early breast cancer clinical trial, called the ATAC breast cancer clinical trial ("ATAC" stands for "ARIMIDEX, Tamoxifen Alone or in Combination"), were treated for 5 years.

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