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Anastrozole Side Effect

Anastrozole Side Effect


Anastrozole is a hormonal therapy drug used to treat breast cancer. It’s best to read this with our general information about breast cancer.

You usually have anastrozole as tablets and as an outpatient. Your cancer doctor or nurse will tell you how long you take it for.

Like all hormonal therapy drugs, anastrozole can cause side effects. Some of these can be serious so it’s important to read the detailed information below. How hormonal therapy affects people varies from person to person. Your doctor or nurse can talk to you more about this and give you advice on how to manage side effects.

Side effects of Arimidex

Other common side effects of Arimidex are:

  • bone and joint pain
  • nausea
  • vomiting
  • hot flashes
  • weakness
  • fatigue

How long do I take Arimidex?

In most cases, you'll take Arimidex for 5 years. Doctors may recommend that some women take it for a longer or shorter period of time.


Anastrozole is used to treat breast cancer in women after menopause. Some breast cancers are made to grow faster by a natural hormone called estrogen. Anastrozole decreases the amount of estrogen the body makes and helps to slow or reverse the growth of these breast cancers.

How to use Anastrozole

Read the Patient Information Leaflet if available from your pharmacist before you start taking anastrozole and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth with or without food as directed by your doctor, usually once a day.

Use this medication regularly to get the most benefit from it. To help you remember, take it at the same time each day.

Do not increase your dose or use this drug more often or for longer than prescribed. Your condition will not improve any faster, and your risk of serious side effects will increase.

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