Azacitidine is a cancer treatment and is also called by its brand name, Vidaza.
It is a treatment for people who can’t have high dose treatment with a stem cell transplant for the following conditions:
- chronic myelomonocytic leukaemia (CMML)
- acute myeloid leukaemia (AML)
- myelodysplastic syndrome
How it works
Azacitidine is a type of drug called a hypomethylating agent. It works by switching off a protein called DNA methyltransferase.
This switches on genes that stop the cancer cells growing and dividing. This reduces the number of abnormal blood cells and helps to control cell growth.
How you have it
You usually have azacitidine as an injection just under your skin (subcutaneously) given by a doctor or nurse. This can be in your upper arm, leg, buttock or stomach.
You might have stinging or a dull ache for a short time after this type of injection but they don't usually hurt much. The skin in the area may go red and itchy for a while.
When you have it
You usually have azacitidine as a course of several cycles of treatment.
You have treatment each day for a week and then 3 weeks with no treatment. This makes up a treatment cycle. You usually have at least 6 cycles and the treatment continues for as long as it is working.
You can also have it every day, for 5 days. Then have 2 days off and have azacitidine again for 2 days at the start of the next week.
You have blood tests before and during your treatment. They check your levels of blood cells and other substances in the blood. They also check how well your liver and kidneys are working.
How often and how severe the side effects are can vary from person to person. They also depend on what other treatments you're having. For example, your side effects could be worse if you're also having other drugs or radiotherapy.
When to contact your team
Your doctor, nurse or pharmacist will go through the possible side effects. They will monitor you closely during treatment and check how you are at your appointments. Contact your advice line as soon as possible if:
- you have severe side effects
- your side effects aren’t getting any better
- your side effects are getting worse
Early treatment can help manage side effects better.
We haven't listed all the side effects here. Remember it is very unlikely that you will have all of these side effects, but you might have some of them at the same time.
Common side effects
These side effects happen in more than 10 in 100 people (more than 10%). You might have one or more of them. They include:
You might develop a cough or breathing problems. This could be due to infection, such as pneumonia or inflammation of the lungs (pneumonitis). Let your doctor or nurse know straight away if you suddenly become breathless or develop a cough.
Inflammation of the nose and throat
Your nose and throat could become swollen and sore.
You might be breathless and look pale due to a drop in red blood cells. This is called anaemia.
Risk of infection
Increased risk of getting an infection is due to a drop in white blood cells. Symptoms include a change in temperature, aching muscles, headaches, feeling cold and shivery and generally unwell. You might have other symptoms depending on where the infection is.
Infections can sometimes be life threatening. You should contact your advice line urgently if you think you have an infection.
Bruising and bleeding
This is due to a drop in the number of platelets in your blood. These blood cells help the blood to clot when we cut ourselves. You may have nosebleeds or bleeding gums after brushing your teeth. Or you may have lots of tiny red spots or bruises on your arms or legs (known as petechiae).
Loss of appetite and weight loss
You might not feel like eating and may lose weight. It is important to eat as much as you can. Eating several small meals and snacks throughout the day can be easier to manage. You can talk to a dietitian if you are concerned about your appetite or weight loss.
It can help to change a few things about how you try to sleep. Try to go to bed and get up at the same time each day and spend some time relaxing before you go to bed. Some light exercise each day may also help.
Dizziness and headaches
Let your doctor or nurse know if you have headaches. They can give you painkillers. Don’t drive or operate machinery if you feel dizzy.
Diarrhoea or constipation
Tell your doctor or nurse if you have diarrhoea or constipation. They can give you medicine to help.
Feeling or being sick
Feeling or being sick is usually well controlled with anti sickness medicines. Avoiding fatty or fried foods, eating small meals and snacks, drinking plenty of water, and relaxation techniques can all help.
It is important to take anti sickness medicines as prescribed even if you don’t feel sick. It is easier to prevent sickness rather than treating it once it has started.
Tummy (abdominal) pain
Tell your treatment team if you have this. They can check the cause and give you medicine to help.
Rash, itchy skin
Skin problems include a skin rash, dry skin and itching. This usually goes back to normal when your treatment finishes. Your nurse will tell you what products you can use on your skin to help.
Joint and muscle pain
You might feel some pain from your muscles and joints. Speak to your doctor or nurse about what painkillers you can take to help with this.
If you get a high temperature, let your health care team know straight away. Ask them if you can take paracetamol to help lower your temperature.
You might feel very tired and as though you lack energy.
Various things can help you to reduce tiredness and cope with it, for example exercise. Some research has shown that taking gentle exercise can give you more energy. It is important to balance exercise with resting.
You might get pain in your chest and shortness of breath. Contact your advice line or tell your doctor if this happens.
Redness, pain and swelling at the injection site
Tell your nurse if you notice any signs of redness or irritation around the injection site.
Occasional side effects
These side effects happen in between 1 and 10 out of every 100 people (between 1 and 10%). You might have one or more of them. They include:
- your bone marrow not being able to make blood cells
- not enough fluid in your body (dehydration)
- feeling confused or anxious
- fluid around your heart - this could affect how your heart works
- sleepiness and lethargy
- high or low blood pressure - you might feel dizzy when standing up or sitting down this is caused by a drop in your blood pressure
- fluid around the lungs - you might feel short of breath
- hair loss
- uncontrolled muscle movement (spasms) and muscle pain
- your kidneys not working (kidney failure)
Rare side effects
These side effects happen in fewer than 1 in 100 people (fewer than 1%). You might have one or more of them. They include:
- allergic reaction
- your liver not working (liver failure)
- high temperature (fever) with large plum coloured, raised painful patches on your skin
- painful skin ulcers
- inflammation of the lining of the heart
Coping with side effects
We have more information about side effects and tips on how to cope with them.
What else do I need to know ?
Other medicines, food and drink
Cancer drugs can interact with some other medicines and herbal products. Tell your doctor or pharmacist about any medicines you are taking. This includes vitamins, herbal supplements and over the counter remedies.
Pregnancy and contraception
This drug may harm a baby developing in the womb. It is important not to become pregnant or father a child while you are having treatment with this drug and for at least 3 months afterwards.
Talk to your doctor or nurse about effective contraception before starting treatment. Let them know straight away if you or your partner falls pregnant while having treatment.
You may not be able to become pregnant or father a child after treatment with this drug. Talk to your doctor before starting treatment if you think you may want to have a baby in the future.
Men might be able to store sperm before starting treatment. And women might be able to store eggs or ovarian tissue. But these services are not available in every hospital, so you would need to ask your doctor about this.
It is not known whether this drug comes through into the breast milk. Doctors usually advise that you don’t breastfeed during this treatment.
Treatment for other conditions
Always tell other doctors, nurses, pharmacists or dentists that you’re having this treatment if you need treatment for anything else, including teeth problems.
Don’t have immunisations with live vaccines while you’re having treatment and for up to 12 months afterwards. The length of time depends on the treatment you are having. Ask your doctor or pharmacist how long you should avoid live vaccinations.
In the UK, live vaccines include rubella, mumps, measles, BCG, yellow fever and one of the shingles vaccines called Zostavax.
You can have:
- other vaccines, but they might not give you as much protection as usual
- the flu vaccine (as an injection)
- the coronavirus (COVID-19) vaccine - talk to your doctor or pharmacist about the best time to have it in relation to your cancer treatment
Members of your household who are aged 5 years or over are also able to have the COVID-19 vaccine. This is to help lower your risk of getting COVID-19 while having cancer treatment and until your
Contact with others who have had immunisations - You can be in contact with other people who have had live vaccines as injections. Avoid close contact with people who have recently had live vaccines taken by mouth (oral vaccines) such as the oral typhoid vaccine.
If your immune system is severely weakened, you should avoid contact with children who have had the flu vaccine as a nasal spray as this is a live vaccine. This is for 2 weeks following their vaccination.
Babies have the live rotavirus vaccine. The virus is in the baby’s poo for about 2 weeks and could make you ill if your immunity is low. Get someone else to change their nappies during this time if you can. If this isn't possible, wash your hands well after changing their nappy.
More information about this treatment
For further information about this treatment go to the electronic Medicines Compendium (eMC) website.
You can report any side effect you have to the Medicines Health and Regulatory Authority (MHRA) as part of their Yellow Card Scheme.
This page is due for review. We will update this as soon as possible.