Interferon alfa is also called by its brand names IntronA and Roferon-A. It is a possible treatment for a number of different types of cancer such as:
- kidney cancer (renal cell cancer)
- multiple myeloma
- some types of leukaemia
- some neuroendocrine tumours (NETs)
- non-Hodgkin lymphoma
It is also used to treat conditions other than cancer including hepatitis B and hepatitis C.
How interferon alfa works
Interferon alfa stimulates T cells and other immune system cells to attack the cancer. It can also encourage cancer cells to send out chemicals that attract immune system cells to them.
How you have interferon alfa
You usually have interferon alfa as an injection just under the skin (subcutaneously). You have it into the tummy (abdomen) or thigh. A nurse may teach you to give the injection yourself at home if you are having interferon for some weeks or months. Or a family member can learn how to do it. You need to keep your interferon in the fridge.
Sometimes you may also have interferon into your bloodstream.
As an injection under the skin (subcutaneous)
You usually have injections under the skin (subcutaneous injection) into the stomach, thigh or top of your arm.
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.
The video below shows you how to give an injection just under your skin (subcutaneously).
Nurse: This is a short film showing you how to give an injection just under your skin. This is called a subcutaneous or sub cut injection. This does not replace what your doctors and nurses tell you, so always follow their advice.
Voiceover: Subcutaneous injections may be part of your cancer treatment. Or, you may need them to prevent side effects of treatment, such as blood clots after surgery. Or to help control cancer symptoms, such as pain or sickness.
Most injections come in prefilled syringes.
Nurse: So, today I am going to show you how to give a subcutaneous injection. I am going to start by giving it into a practice cushion and then you can have a go at giving one yourself. Before you start, you need to get your equipment together. What you are going to need is an alcohol wipe to clean your skin, some cotton wool, a prefilled syringe and a sharps bin. It is important that you wash your hands with soap and water and dry them thoroughly before you start. Check that you have got the correct drug and that it is in date.
You can give the injection into the back of your arm, your tummy, your thigh or the outer part of your bottom. It is important that you vary where you give the injection. So it may be that you give it one day in your tummy and the next in your thigh.
So you start by cleaning the skin with the alcohol wipe and allowing it to air dry. Then you take the cover off the needle and pinch the skin up and hold it a bit like a pen and in an upright position, in a quick dart like motion pop it straight down into the skin. Then you press the plunger right to the end, quickly pull the needle out, dab it with cotton wool, pop the needle into the sharps bin. And then you need to wash your hands again.
So here’s what you are going to need. If you start by checking the drug and the expiry date. And then with the alcohol wipe give your skin a clean. That’s it give it a few seconds for the air to dry it. Ok and then if you want to pick up the syringe and take the cover off the needle. Then pinch your skin up and at a ninety degree angle gently push the needle in...then press the plunger...and then quickly remove it... dab your skin with the cotton wool and put the syringe in the sharps bin.
As a drip into your bloodstream
You have the treatment through a drip into your arm. A nurse puts a small tube (a cannula) into one of your veins and connects the drip to it.
When you have interferon alfa
How often you have interferon alfa depends on your cancer type. You usually have it every day or 3 times a week.
Depending on your needs, you may continue to have interferon alfa for a number of months.
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.
We haven't listed all the side effects. It is very unlikely that you will have all of these side effects, but you might have some of them at the same time.
How often and how severe the side effects are can vary from person to person. They also depend on what other treatment you are having. For example, your side effects could be worse if you are 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.
Common side effects
These side effects happen in more than 10 in 100 people (10%). You might have one or more of them. They include:
Increased 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.
It can help to change a few things about when and where you 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.
You might have a change in your mood. Changes can include irritability, excitement, restlessness or depression.
Headaches and dizziness
Let your doctor or nurse know if you have headaches. They can give you painkillers. Don’t drive or operate heavy machinery if you feel dizzy.
A dry mouth is also called xerostomia (pronounced zero-stow-mee-a). Talk to your nurse or doctor if you have this. They can give you artificial saliva to help with a dry mouth. It can also help to drink plenty of fluids after treatment.
Do not drive or operate machinery if you have this symptom and speak to your doctor.
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.
Tummy (abdominal) pain
Tell your doctor or nurse if you have this. They may give you medicine to help.
Contact your advice line if you have diarrhoea, that is 4 loose watery poos (stools) in 24 hours. Or if you can't drink to replace the lost fluid, or if it carries on for more than 3 days. Your doctor may give you anti diarrhoea medicine to take home with you after treatment. Eat less fibre, avoid raw fruits, fruit juice, cereals and vegetables, and drink plenty of liquid to replace the fluid lost.
It may be painful to swallow drinks or food. Painkillers and mouth washes can help to reduce the soreness and keep your mouth healthy.
Taste changes may make you go off certain foods and drinks. You may also find that some foods taste different from usual or that you prefer to eat spicier foods. Your taste gradually goes back to normal a few weeks after your treatment finishes.
Your hair may thin but you’re unlikely to lose all your hair. This usually starts after your first or second cycle of treatment. It is almost always temporary and your hair will grow back when you finish your treatment.
Let your doctor know if you are sweating more than normal. They may be able to prescribe medicines to help. Cutting out alcohol and caffeine may help with sweating.
Pain in your muscles and joints
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.
Inflammation at the injection site
You might notice redness, swelling and pain around the area where you have had the injection.
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.
Flu like symptoms
This can happen a few hours after treatment. It may include headaches, muscle aches (myalgia), a high temperature and shivering. Taking paracetamol every 6 to 8 hours can help.
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.
Occasional side effects
These side effects happen in between 1 and 10 out of every 100 people (1 to 10 %). You might have one or more of them. They include:
- a drop in the number of red blood cells and platelets in your blood which may cause tiredness, nosebleeds or bleeding gums
- changes in the levels of thyroid hormones
- low levels of calcium in your body
- loss of fluid in your body (dehydration)
- high levels of uric acid in your body
- pins and needles in your arms and legs
- tremor or shaking hands
- redness (flushing) of the skin
- redness, inflammation and pain in your eyes
- hearing changes such as hearing loss and ringing in your ears (tinnitus)
- heart problems such as palpitations, a high heart rate (tachycardia) and high blood pressure
- coughing and difficulty breathing
- skin rash
- feeling thirsty
- passing urine more often
- loss of sex drive
- painful menstrual periods or loss of your periods
- breast pain
Rare side effects
These side effects happen in fewer than 1 in 100 people (1%). You might have one or more of them. They include:
- a serious whole body infection (sepsis)
- changes to your blood sugar levels and diabetes
- increased appetite
- suicidal thoughts and hearing voices (hallucinations)
- numbness and tingling in the feet and hands
- bleeding in the brain
- inflammation of the heart and a heart attack
- low blood pressure
- inflammation of the lungs, pancreas and bowel
- pain in your back
- an enlarged liver
- increase in the level of liver enzymes
- protein in your urine
- damage to the kidneys that causes them to not work properly
- a severe skin reaction that may start as tender red patches which leads to peeling or blistering of the skin. You might also feel feverish and your eyes may be more sensitive to light. This is serious and could be life threatening
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, foods and drinks
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.
Loss of fertility
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 may be able to store sperm before starting treatment. Women may be able to store eggs or ovarian tissue but this is rare.
Pregnancy and contraception
It is unknown whether treatment may or may not harm a baby developing in the womb. It is important not to become pregnant or father a child while you are having treatment.
Talk to your doctor or nurse about effective contraception you can use during treatment. Ask how long you should use it before starting treatment and after treatment has finished.
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 the shingles vaccine (Zostavax).
- have other vaccines, but they might not give you as much protection as usual
- have the flu vaccine (as an injection)
- 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 oral polio or the typhoid vaccine.
This also includes the rotavirus vaccine given to babies. The virus is in the baby’s poo for up to 2 weeks and could make you ill. So avoid changing their nappies for 2 weeks after their vaccination if possible. Or wear disposable gloves and wash your hands well afterwards.
You should also avoid close contact with children who have had the flu vaccine nasal spray if your immune system is severely weakened.
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.