Medically reviewed on October 4, 2018
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
Therapeutic Class: Antineoplastic Agent
Pharmacologic Class: Aromatase Inhibitor
Uses For anastrozole
Anastrozole is used to treat certain types of breast cancer in women who have already stopped menstruating (postmenopausal). It is also used for women who have already had other cancer treatments (e.g., tamoxifen).
Many breast cancer tumors grow in response to estrogen. Anastrozole interferes with the production of estrogen in the body. As a result, the amount of estrogen that the tumor is exposed to is reduced, limiting the growth of the tumor.
Anastrozole is available only with your doctor's prescription.
Before Using anastrozole
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For anastrozole, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to anastrozole or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies performed to date have not demonstrated pediatric-specific problems that would limit the usefulness of anastrozole in children.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of anastrozole in the elderly.
|All Trimesters||X||Studies in animals or pregnant women have demonstrated positive evidence of fetal abnormalities. This drug should not be used in women who are or may become pregnant because the risk clearly outweighs any possible benefit.|
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking anastrozole, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using anastrozole with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Interactions with Food/Tobacco/Alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other Medical Problems
The presence of other medical problems may affect the use of anastrozole. Make sure you tell your doctor if you have any other medical problems, especially:
- Bone problems (osteoporosis) or
- Hypercholesterolemia (high cholesterol or fat in the blood) or
- Ischemic heart disease (heart attack, angina), history of, or
- Liver disease—Use with caution. May make these conditions worse.
- Premenopausal women (have menstrual cycles)—Should not be used in these patients.
Proper Use of anastrozole
Take anastrozole only as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered. To do so may increase the chance for side effects.
You may take anastrozole with or without food.
Anastrozole sometimes causes nausea, vomiting, or diarrhea. However, it is very important that you continue to use the medicine, even if you begin to feel ill. Ask your doctor for ways to prevent these effects or make them less severe.
Anastrozole comes with a patient information leaflet. Read and follow these instructions carefully. Ask your doctor if you have any questions.
The dose of anastrozole will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of anastrozole. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For oral dosage form (tablets):
- For breast cancer:
- Adults—1 milligram (mg) once a day.
- Children—Use and dose must be determined by your doctor.
- For breast cancer:
If you miss a dose of anastrozole, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Precautions While Using anastrozole
It is important that your doctor check your progress at regular visits to make sure that anastrozole is working properly. Blood tests may be needed to check for unwanted effects.
It is unlikely that a postmenopausal woman may become pregnant. But, you should know that using anastrozole while you are pregnant could harm your unborn baby. Use an effective form of birth control to keep from getting pregnant. If you think you have become pregnant while using the medicine, tell your doctor right away.
Anastrozole may cause a serious type of allergic reaction called anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Call your doctor right away if you have itching; hives; hoarseness; trouble breathing; trouble swallowing; or any swelling of your hands, face, or mouth while you are using anastrozole.
Anastrozole may decrease bone mineral density when used for a long time. A low bone mineral density can cause weak bones or osteoporosis. If you have any questions about this, talk to your doctor.
Anastrozole may increase your cholesterol or fat in the blood. If this happens, your doctor may give you medicine to lower the cholesterol and fat.
Stop taking anastrozole and check with your doctor right away if you start having chest pains or shortness of breath. Anastrozole may increase the chance of heart attack or stroke in women who have a history of ischemic heart disease.
Anastrozole Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
- Blurred vision
- chest pain or discomfort
- pounding in the ears
- shortness of breath
- slow or fast heartbeat
- swelling of the feet or lower legs
- Arm, back, or jaw pain
- chest tightness or heaviness
- cough or hoarseness
- difficult or painful urination
- dizziness, severe
- fever or chills
- headache, continuing
- increased blood pressure
- lower back or side pain
- pain, tenderness, bluish color, or swelling of the foot or leg
- sore throat
- sudden shortness of breath
- unusual tiredness or weakness
- vaginal bleeding (unexpected and heavy)
Incidence not known
- Blistering, peeling, or loosening of the skin
- itching, puffiness, or swelling of the eyelids or around the eyes, face, lips, or tongue
- large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
- red skin lesions, often with a purple center
- sores, ulcers, or white spots in the mouth or on the lips
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Acid or sour stomach
- back pain
- body aches or pain
- bone pain
- decrease in height
- dry mouth
- dryness or soreness of the throat
- feeling of warmth
- flushing or redness of the skin, especially on the face and neck
- hot flashes
- increased appetite
- lack or loss of strength
- loss of appetite
- mood or mental changes
- pain in the back, ribs, arms, or legs
- pain, general
- pelvic pain
- runny nose
- skin rash
- stomach discomfort, upset, or pain
- tender, swollen glands in the neck
- trouble in swallowing
- voice changes
- weight loss
- Anxiety and confusion
- breast pain
- cough producing mucus
- difficulty breathing
- dryness of the vagina
- general feeling of discomfort or illness
- itching of the skin
- joint pain and stiffness
- loss of hair
- muscle pain
- numbness or tingling of the hands or feet
- sleepiness or unusual drowsiness
- trouble sleeping or sleeplessness
- weight gain
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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More about anastrozole
- Anastrozole Side Effects
- During Pregnancy
- Dosage Information
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- Drug class: aromatase inhibitors
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