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Disclaimer: This page provides general information about Arimidex (anastrozole). It is for residents of the United Kingdom. It is not a substitute for medical advice. Always talk to your doctor or pharmacist about your own situation.

What is Arimidex?

Arimidex is the brand name for the generic medicine anastrozole. It is a type of hormone therapy used in the treatment of certain breast cancers that are sensitive to hormones. In the United Kingdom, its use may require a prescription depending on local rules and guidance.

The medicine belongs to a class known as aromatase inhibitors. It works by reducing the amount of oestrogen (a female hormone) produced in the body. Some breast cancers grow in response to oestrogen, so lowering its level can help slow or stop cancer growth.

Arimidex is usually prescribed for adults and is not intended for use in children. It is commonly used in postmenopausal women, and it is not a chemotherapy drug. It is often combined with other cancer treatments as part of a broader treatment plan, depending on the individual case and the doctor’s assessment.

If you are unsure about any information, check the official leaflet that comes with the medicine or ask your doctor or pharmacist for guidance. Do not rely on this page alone for medical decisions.

What is Arimidex used for?

Arimidex is used in the treatment of hormone receptor-positive breast cancer in adults. It is typically prescribed for postmenopausal women who have completed primary treatment such as surgery, radiotherapy, or chemotherapy, and who need ongoing therapy to reduce the risk of cancer returning or to help control advanced disease.

In some cases, Arimidex may be used for metastatic breast cancer (cancer that has spread to other parts of the body). The decision to use Arimidex depends on the cancer’s characteristics, previous treatments, and the patient’s overall health. Your clinician will consider these factors when planning therapy.

The medicine is not a chemotherapy agent. It is a targeted endocrine therapy that aims to slow cancer growth by lowering oestrogen levels in the body. It may be prescribed as a single treatment or in combination with other medicines as part of a treatment plan.

This section provides general information about uses. Your clinician will confirm whether Arimidex is appropriate for you. If you have questions about why it has been prescribed, ask your doctor or pharmacist for a personalised explanation.

How does Arimidex work?

Anastrozole reduces oestrogen production by blocking the aromatase enzyme, which is involved in converting androgens into oestrogen in the body. With lower oestrogen levels, hormone-sensitive breast cancer cells may grow more slowly or stop growing.

Because its effect is systemic, the action of Arimidex depends on circulating hormones and tissue factors. The aim is to create a hormonal environment less conducive to cancer growth. This mechanism is distinct from traditional chemotherapy and can be used in combination with other cancer therapies as advised by a healthcare professional.

The change in oestrogen levels occurs over time and may continue as long as the medicine is taken. Your clinician will monitor how you respond to treatment and adjust the plan if needed. If you have questions about how the drug works in your specific situation, discuss them with your doctor.

It is important to follow the treatment plan provided by your clinician. If you have concerns about how Arimidex works or its effects, talk to a pharmacist or doctor for clarification.

How should Arimidex be used?

Arimidex is typically taken by mouth as a tablet. It is usually taken once daily. The exact timing and duration of treatment depend on the individual’s cancer type, treatment goals, and response to therapy. Do not change the dose or frequency unless advised by your clinician.

Take Arimidex exactly as prescribed. Swallow the tablet with a glass of water. You may take it with or without food. Try to take it at the same time each day to help you remember. Do not crush or chew the tablet unless your doctor has told you otherwise.

If you miss a dose, take it as soon as you remember, unless it is almost time for your next dose. In that case, skip the missed dose and resume your regular schedule. Do not double the dose to catch up. If you are unsure what to do after missing a dose, contact your healthcare professional for advice.

Arimidex should be used under medical supervision. Do not stop taking it or start any new medicines without discussing with your doctor or pharmacist, even if you feel well. If you are undergoing surgery or planning to become pregnant, inform your surgeon or clinician that you are taking Arimidex, as part of the overall management plan may change.

Who should avoid Arimidex?

Avoid Arimidex if you are pregnant or planning to become pregnant. The medicine may harm an unborn baby, and it can affect a woman who is breastfeeding. If pregnancy is possible, you should use effective contraception while taking Arimidex and for a period after stopping treatment, as advised by your clinician.

Do not take Arimidex if you are allergic to anastrozole or any ingredient in the medicine. An allergic reaction can be serious and may require immediate medical attention. Seek help from a healthcare professional if you notice signs of a severe reaction after taking the medicine.

If you have severe liver or kidney problems, discuss with your doctor whether Arimidex is appropriate for you. The clinician may adjust treatment or monitor liver function and other health indicators during therapy. Do not stop or change treatment without professional guidance.

There may be other situations where Arimidex should be avoided or used with extra care. Always inform your clinician about all health conditions, ongoing medications, and supplements before starting treatment. If you are unsure whether you should take Arimidex, consult your pharmacist or doctor for a personalised assessment.

What should I know before using Arimidex? (Warnings)

Arimidex can affect bone health. Long-term oestrogen suppression may be associated with thinning of the bones and an increased risk of fractures, especially in individuals with other risk factors for bone loss. Your clinician may discuss strategies to protect bone health, including lifestyle measures and monitoring.

Some people experience changes in lipid levels, liver function, or skin and nail health while taking Arimidex. Your doctor may order tests to monitor these aspects during therapy and adjust treatment if needed. If you notice persistent yellowing of the skin or eyes, dark urine, severe abdominal pain, or unusual fatigue, seek medical advice promptly.

Common side effects such as hot flushes, joint stiffness, and fatigue may affect daily activities. If these symptoms interfere with your comfort or daily function, speak with your clinician. They can assess whether supportive care or a change in treatment is appropriate.

Avoid combining Arimidex with other therapies or supplements that your clinician has not approved. Some medicines can interact with Arimidex and affect its effectiveness or increase the risk of side effects. Always tell your healthcare team about all medicines you are taking, including over-the-counter drugs and herbal products.

What are the possible side effects?

As with many medicines, Arimidex can cause side effects. Some people have no side effects, while others may experience symptoms. The most commonly reported effects include hot flashes, sweating, and joint or bone pain. Fatigue and headaches are also possible, along with nausea or skin rashes in some individuals.

Less common but more serious side effects may require medical attention. Signs to watch for include yellowing of the skin or eyes, dark urine, severe abdominal or chest pain, or swelling of the legs. If you notice signs of an allergic reaction such as swelling of the face or throat, trouble breathing, or a widespread rash, seek urgent medical help.

Bone health changes and risk of fractures may occur with long-term use. Your clinician may offer bone density testing or recommend supplements, weight-bearing exercise, or other strategies to help protect bones during therapy.

If you experience any side effects that concern you or persist for longer than a few days, contact your doctor or pharmacist for guidance. They can assess whether the symptoms are related to Arimidex and suggest appropriate management or alternatives.

Could Arimidex interact with other medicines?

Arimidex can interact with other medicines, which may change how well it works or increase the risk of side effects. Always tell your doctor about all medicines you take, including prescription medicines, over-the-counter drugs, vitamins, and herbal supplements.

Some medicines that influence hormonal pathways or liver enzymes could affect how Arimidex works. In particular, discuss any estrogen-containing products or other endocrine therapies with your clinician, as these may impact treatment plans.

Do not start or stop any other medicines without medical advice while you are taking Arimidex. Your pharmacist can check for potential interactions and advise on safe use. If you notice new symptoms after starting a new medicine, inform your doctor promptly.

If you are unsure whether a medicine you plan to use interacts with Arimidex, ask a pharmacist or doctor for an assessment before taking it. This includes supplements and non-prescription remedies you may have at home.

Pregnancy and breastfeeding

Arimidex may harm an unborn baby and is not recommended during pregnancy. If pregnancy is possible, use effective contraception while taking Arimidex and for an appropriate period after stopping treatment, as advised by your clinician.

Breastfeeding is not advised during treatment with Arimidex. If you are breastfeeding, you should discuss alternative options with your healthcare provider. The safety of Arimidex in breastfed infants has not been established in all situations.

If you discover you are pregnant or plan to become pregnant while taking Arimidex, seek immediate medical advice. Do not stop or adjust treatment on your own; a healthcare professional will guide you on the best course of action for you and the baby.

Always discuss family planning and pregnancy intentions with your clinician before starting Arimidex, especially if you may become pregnant in the future. If you have questions about fertility or future pregnancies, talk to a healthcare professional for tailored information.

Frequently asked questions (FAQ)

How quickly does Arimidex start to work?

Arimidex lowers oestrogen levels by blocking the aromatase enzyme. The effect on hormone levels occurs gradually and continues while the medicine is taken. Improvement or disease control is assessed over time by your clinician through regular check-ups and scans if needed.

Because responses can vary between individuals, there is no single time frame to expect full results. If you have concerns about how you are responding to treatment, speak with your doctor in your next appointment or sooner if needed. Do not adjust the treatment plan on your own.

What should I do if I forget a dose?

If you miss a dose, take it as soon as you remember, unless it is almost time for your next dose. If it is nearly time for your next dose, skip the missed dose and resume your normal schedule. Do not take a double dose to make up for the one you missed. If you are unsure, contact your healthcare professional for guidance.

Can Arimidex be used with other cancer treatments?

Arimidex is often used as part of a broader treatment plan. It may be combined with other medicines as directed by your clinician. Do not start or change other cancer treatments without first discussing with your doctor, even if you feel well. Your team will coordinate therapy to fit your individual needs.

When should I contact a doctor or seek urgent help?

Contact a healthcare professional if you notice signs of an allergic reaction, unusual skin changes, persistent severe joint or bone pain, yellowing of the skin or eyes, dark urine, or severe abdominal pain. Seek urgent medical help if you experience symptoms such as chest pain, trouble breathing, swelling of the legs, or signs of a serious infection or liver problem.

Can I drink alcohol while taking Arimidex?

Moderate alcohol consumption is unlikely to interfere with Arimidex in most cases. However, alcohol can affect overall health and well-being during cancer treatment. Discuss your alcohol use with your clinician, who can advise based on your overall health and other treatments you may be receiving.

Is Arimidex suitable for men with breast cancer?

Arimidex is primarily prescribed for hormone receptor-positive breast cancer in postmenopausal women. In men, the use of Arimidex is less common and depends on the specific medical situation. If you are a man considering this treatment, discuss with your oncologist to understand the potential benefits and risks for your case.

How should Arimidex be stored?

Store Arimidex tablets at room temperature, away from light and moisture. Keep them in their original container unless instructed otherwise by your pharmacist. Keep out of reach of children and pets. Do not use medication that is past its expiry date or that shows signs of damage.

Will Arimidex affect my sleep or mood?

Some people report fatigue, sleep disturbances, or mood changes while taking Arimidex. If these symptoms are troubling or persistent, discuss them with your clinician. They can determine whether these effects are related to the treatment and whether any supportive measures are appropriate.

What should I tell my doctor before starting Arimidex?

Inform your doctor about all health conditions, ongoing medications, and any supplements you take. This includes liver or kidney problems, osteoporosis, high cholesterol, and any allergies. Providing a complete medical history helps your clinician tailor the treatment plan and monitor for potential interactions or complications.

Can I stop taking Arimidex if I feel better?

Do not stop Arimidex without talking to your clinician. Stopping treatment prematurely can increase the risk of the cancer returning or progressing, depending on the treatment plan. If you experience troublesome side effects, your doctor can discuss adjustments or alternatives.

Is there anything I should avoid while taking Arimidex?

Avoid starting new medicines or supplements without consulting your healthcare team. Some products may interact with Arimidex or affect bone health. If you have any questions about a product you plan to use, ask a pharmacist or doctor first.

Sources

United Kingdom patient information leaflets for Arimidex (anastrozole) and related products provided by manufacturers and authorised healthcare bodies are used to construct this page. Information is cross-checked with standard medical references and official guidelines where applicable.

Additional guidance may come from national health authorities and cancer care organisations in the UK. Always refer to your clinician’s advice and the official patient information for the medicine you are taking. If you have questions about the information on this page, please speak to your pharmacist or doctor.