What is anagrelide?
Anagrelide is a medication used to treat myeloproliferative neoplasms (MPNs). In Australia the drug goes under the brand name Agrylin®. Anagrelide is only approved as therapy for essential thrombocythaemia (ET) in Australia. It is not currently funded under the PBS. Anagrelide is currently available in 0.5mg (500mcg) white opaque capsules. It is an oral medication and is usually taken twice a day.
How does anagrelide work?
Anagrelide acts to reduce the number of platelets in the blood. Platelets are produced in the bone marrow by megakaryocytes which are derived from stem cells. Platelets bud-off from the megakaryocytes and enter the blood stream. Anagrelide reduces the production of new platelets by megakaryocytes and hence lowers the platelet count in the blood. By controlling platelet numbers in patients with essential thrombocythaemia the risk of thrombotic (clotting) and haemorrhagic (bleeding) complications is reduced.
How can anagrelide treat my MPN?
Anagrelide is currently recommended for use in individuals who are unable to tolerate other drugs, such as hydroxycarbamide, used to treat high platelet counts in patients with myeloproliferative neoplasms. Very occasionally patients are treated with both hydroxycarbamide and anagrelide simultaneously. Anagrelide does not reduce the neutrophil (white cell) count but it can cause anaemia in some patients. Reducing the platelet count in patients with essential thrombocythaemia reduces the risk of thrombotic (clotting) and haemorrhagic (bleeding) complications. It may also help to reduce any symptoms experienced as a result of having too many platelets, such as headache, visual problems, fatigue, or tingling in fingers and toes.
Are there any drawbacks?
As with all medications you may experience side effects whilst taking anagrelide. These are listed in the side effects section below. You will need frequent blood tests and monitoring whilst taking anagrelide to ensure that the dose is correct for you. Anagrelide only reduces platelet counts and if you have elevated red cells or white cells you may either require an additional drug or venesection therapy to control this. A small number of people will not respond to anagrelide or may develop resistance to anagrelide over a period of years, requiring a switch to another treatment. Anagrelide does not appear to reduce the development of post-ET myelofibrosis in the small number of patients with ET who may be at risk of developing this complication.
Are there any side effects?
Most people taking this drug tolerate it well and have few side effects. However, it is important that you inform your doctor if you are experiencing any of the side effects listed below or any other new symptoms, even if they are mild. Anagrelide can cause episodes of fast heart rate, so your haematologist will check your heart rate before you start treatment.
Very common side effects
Approximately 10% of people taking anagrelide will experience some of these side effects:
Less common side effects
Approximately 1–10% of people taking anagrelide will experience some of these side effects:
- Fluid retention (swollen hands and feet)
- Fast heart beat (tachycardia)
Uncommon side effects
Uncommon side effects affecting less than 1% of patients include:
- Weight loss
- Sleep disturbances
- Flu like symptoms
- Loss of strength/weakness
- Cardiac or heart side effects
If you experience any of the symptoms above please inform your doctor.
How to take anagrelide
- Usually given twice a day
- Can be taken either before or after food and at any time of the day
- Swallow whole with plenty of water
- Do not split the capsule
- Take at the same time every day
Your doctor will give instructions about what dose you are to take. You will be started on a low dose which will gradually increase until your platelet count improves to the level your doctor has decided is appropriate for you.
It may be helpful to keep a record to remember when to take your tablets and to record any side effects.
Storage and disposal of anagrelide
- Store in a dry place at room temperature.
- As with all medications anagrelide can be harmful to others. Keep all medications in a secure location well out of the reach of children and pets.
- Return any unused capsules to your local pharmacy or hospital. Do not dispose of them in the bin or flush them down the toilet.
- Do not use tablets after the expiry date which is stated on the packaging.
Can I take other medicines or vitamins, herbal supplements or remedies if I am taking anagrelide?
Whenever you take anagrelide (or in fact any medication), it is important to inform your medical advisors about all other medications you are taking; this includes medicines prescribed for you as well as any vitamins, herbal supplements or remedies bought in chemists. Always provide the names of these medications and remedies to the hospital doctors, GPs, and pharmacists who are treating you, prescribing additional medications or giving you advice. It can be very helpful to carry a list of the names and dosages of all your medicines to show to your doctor at appointments. Some medicines may interact or need to be used with caution when taking with anagrelide. These include:
- Anti-inflammatory medications (eg Naproxen, Voltaren)
What should I expect when I begin treatment?
How fast does it work?
Anagrelide can take several weeks to start reducing your platelet count particularly since it is recommended to start therapy at a low dose and increase gradually. You will probably not feel any benefits until your counts are under control.
How will I feel?
As your blood counts reduce you may notice that you experience fewer symptoms. Most people taking this drug tolerate it well and have relatively few side effects, and side effects usually become less noticeable over time.
Will I need follow up?
You will need more frequent blood tests during the first weeks of treatment to determine how your body is responding to the medication. Once your body begins to adjust to the treatment you will need less frequent checks, perhaps every two to three months. Your haematologist may check your kidney and liver and heart function with blood tests or scans.
What if I have other medical conditions?
Anagrelide should be used under supervision if you have or have had any of the following conditions:
- Heart problems
- Kidney problems
- Liver problems
If you think you may have one of these conditions please discuss this with your doctor.
Frequently asked questions
Can I eat and drink normally?
Yes. We recommend that you eat a normal, healthy diet and drink plenty of water.
Can I drink alcohol?
While it is safe to drink alcohol in moderation whilst taking anagrelide, Australian NHMRC guidelines state that for healthy women and men drinking no more than two standard drinks on any day reduces your risk of harm from alcohol-related disease. Alcohol can cause dehydration, and it is important to avoid becoming dehydrated if you have an MPN. Please ask your doctor if you require more information regarding alcohol consumption.
What if I want to have a child?
We strongly recommend that you use contraception whilst taking anagrelide, because this medication can be harmful to a developing foetus.
It is imperative to discuss your plans together with your haematologist prior to becoming pregnant or fathering a child. Your doctor can recommend treatment options for you that will not cause harm to your developing foetus and will increase your chance of a successful pregnancy. If you are planning to conceive or to father a child it will be necessary to stop taking anagrelide for at least three months to allow the drug to clear from your system before trying to conceive.
Can I breastfeed while taking anagrelide?
We strongly recommend against breastfeeding your child whilst taking anagrelide. Anagrelide is a very strong drug that inhibits blood cell development. It can be secreted in breast milk and this may affect your baby’s development.
Who will prescribe anagrelide for me?
Your haematologist will prescribe your medication.
Can I drive?
Anagrelide can occasionally cause dizziness and drowsiness; if you experience these side effects your ability to drive may be affected. If you are feeling drowsy or fatigued for any reason do not drive.
Do I need to take any special precautions?
Your skin may be more sensitive to sun whilst you are taking anagrelide. You may need to protect your skin by avoiding exposure to the sun, using sunscreen and wearing protective clothing and a hat.
Can I have vaccinations such as the flu jab while taking anagrelide?
You can have most vaccinations including the flu vaccine whilst taking anagrelide. However, some vaccinations are live vaccines and should not be taken with anagrelide. It is important you talk to your haematologist and tell the person giving you the vaccine that you are taking anagrelide so they can check that it will be safe for you.
What to do if…
You have taken too much medicine/someone else has taken your medicine
If you have taken extra tablets or if another person has taken your medication please contact your nurse or doctor as soon as possible.
You were sick shortly after taking your tablets
If you are sick just once, take your next dose as usual. If you are sick over a number of days please contact your doctor.
You forget to take a dose
If you have forgotten to take a dose, do not take any extra but take your next dose as normal. If you have forgotten to take a few doses, start taking them again and contact your doctor.
If you need to have a medical procedure or operation
You may occasionally be required to adjust or stop taking anagrelide if you need an operation. It is important that the doctor or dentist planning the procedure or operation be informed that you are taking anagrelide and that he or she plans your procedure together with your haematologist. We always recommend that you inform your haematologist when planning any procedures or operations.
If you feel anxious about taking anagrelide
If you have concerns, please discuss this with your haematologist or GP.
What if I do not want to take this medication?
Whether or not to take anagrelide is your decision. If after discussing everything with your haematologist you still feel uncertain or prefer not to take this medication, you can choose not to take it but it is best to discuss this with your treating haematologist so alternate therapy for your MPN can be prescribed. If you decide not to take anagrelide or if you elect to stop after you begin treatment, it is important to inform your doctor of your decision. He or she can recommend alternatives or other suggestions if necessary to safeguard your health.