Arimidex (Anastrozole)
Complete patient guide for uses, dosage, side effects, and safety information
Quick Facts
What Is Arimidex Used For?
Arimidex is a medication that contains anastrozole, which is used primarily for treating breast cancer in women who have stopped having menstrual periods, either naturally or due to medical interventions.
Primary Uses
It is used to treat breast cancer in women who are postmenopausal.
How It Works
Arimidex works by reducing the amount of estrogen produced by the body, which can help slow or stop the growth of certain types of breast cancer that rely on estrogen.
Good to know: Arimidex is not addictive.
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How to Take Arimidex
It is important to take Arimidex as prescribed by your healthcare provider.
Dosage Instructions
The usual dosage is one tablet taken once daily, swallowed whole with a glass of water.
What If You Miss a Dose?
If you forget to take a dose, take it as soon as you remember if it is at least 12 hours before the next dose. If it is less than 12 hours, skip the missed dose and continue with your regular schedule. Do not take a double dose.
Important: Never double dose to make up for a missed dose.
Available Tablet Strengths
Side Effects
Like all medications, this medicine can cause side effects. Most are mild and temporary, but some require medical attention.
Common Side Effects
These side effects occur relatively frequently and usually don’t require emergency care:
- hot flushes
- feeling weak or lacking energy
- joint pain or stiffness
- bone loss (osteoporosis)
- mild skin rash
- nausea
- headache
- feeling depressed
Seek immediate medical attention if you experience:
- signs of severe allergic reactions such as difficulty breathing, swelling of the face or throat, rash, or hives
- severe skin reactions with lesions or blisters
- liver pain or swelling, or jaundice (yellowing of the skin and eyes)
Important Warnings
There are several important warnings to consider before taking Arimidex.
Who Should Not Take Arimidex
Do not take Arimidex if you are allergic to anastrozole or any of its ingredients, are still having menstrual periods, or are male.
Medical Conditions to Discuss
Discuss any liver or kidney problems, allergies, or conditions such as osteoporosis with your doctor before using Arimidex.
Pregnancy and Breastfeeding
Do not take Arimidex if you are pregnant or planning to become pregnant, as it may harm your developing baby. Do not breastfeed while taking this medication.
Drug Interactions
Some medications may interact with Arimidex and affect its effectiveness.
- tamoxifen
- any medicine containing estrogen (e.g., Hormone Replacement Therapy, oral contraceptives)
- health products containing natural estrogens
- Luteinising Hormone Releasing (LHRH) agonists like goserelin or leuprorelin
Alcohol & Driving
Be cautious when driving or operating machinery until you know how Arimidex affects you.
Alcohol
Consult your doctor about alcohol consumption while taking Arimidex.
Driving and Operating Machinery
Some patients may feel weak or sleepy; exercise caution.
Storage
Store Arimidex in its blister pack in a cool, dry place below 30°C, away from moisture and heat.
Overdose Information
If you suspect an overdose, seek immediate medical attention. Contact your doctor or the Poisons Information Centre at 13 11 26.
Frequently Asked Questions
The time it takes for Arimidex to work can vary based on individual response and treatment plan. Consult your doctor for specific timelines.
You can take Arimidex before, with, or after food; it does not affect its effectiveness.
No, Arimidex is not addictive.
Do not stop taking Arimidex without consulting your doctor, as it may affect your treatment.
Consult your doctor regarding alcohol consumption while on Arimidex.
Weight changes can occur, but consult your doctor for personalized advice.
Elderly patients should discuss their overall health and any medications with their doctor before starting Arimidex.
Important Disclaimer
This information is intended for general educational purposes only and should not be considered medical advice. Always consult your healthcare provider or pharmacist before starting, stopping, or changing any medication.
If you think you may have a medical emergency, call your doctor or emergency services immediately.