Raltitrexed is a chemotherapy drug and is also known by its brand name, Tomudex.
It is a treatment for bowel (colorectal) cancer that has spread and is often given with other cancer drugs.
How it works
Raltitrexed is from a group of drugs known as anti metabolites.
Anti metabolites stop cells making and repairing DNA. Cancer cells need to make and repair DNA so they can grow and form more cells.
How you have it
You have raltitrexed into your bloodstream (intravenously) over 15 minutes.
Into your bloodstream
You might have the treatment through a drip into your arm. Your nurse puts a small tube (a cannula) into one of your veins and connects the drip to it.
Or you might need a central line. This is a long plastic tube that gives the drugs into a large vein, either in your chest or through a vein in your arm. It stays in the whole time you are having treatment.
When you have treatment
You have raltitrexed every 3 weeks (21 days). Each 3 week period is a cycle of treatment. Your doctor will tell you how many cycles you need.
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 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 or nurse 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
Each of these effects happens in more than 1 in 10 people (more than 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.
Breathlessness and looking pale
You might be breathless and look pale due to a drop in red blood cells. This is called anaemia.
Tiredness and weakness during and after treatment
Tiredness and weakness (fatigue) can happen during and after treatment - doing gentle exercises each day can keep your energy up. Don't push yourself, rest when you start to feel tired and ask others for help.
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.
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.
Mouth sores and ulcers
Mouth sores and ulcers can be painful. It helps to keep your mouth and teeth clean, drink plenty of fluids, avoid acidic foods such as oranges, lemons and grapefruits and chew gum to keep the mouth moist. Tell your doctor or nurse if you have ulcers.
Tummy (abdominal) pain
Tell your treatment team if you have this. They can check the cause and give you medicine to help.
You might have liver changes that are usually mild and unlikely to cause symptoms. They usually go back to normal when treatment finishes. You have regular blood tests to check for any changes in the way your liver is working.
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.
Dehydration means there isn't enough fluid in your body. You might find you aren't passing much urine and the colour is a very dark yellow. Your skin might be very dry and you might feel dizzy. So make sure you drink around 2 litres of fluids every day. Tell your nurse or doctor if you are not able to drink this much fluid.
Occasional side effects
Each of these effects happens in between 1 and 10 out of every 100 people (between 1 and 10%). You might have one or more of them. They include:
- bruising, bleeding gums and nosebleeds due to a drop in platelets (blood cells that help the blood clot)
- flu like symptoms such as high temperature, chills and headache
- a severe infection
- swelling of the hands and feet
- increased sweating
- changes to taste
- sore red, itchy, watery eyes - conjunctivitis
- hair loss
- aching joints
- muscle cramps
- yellow skin and eyes this is jaundice, tell your doctor or nurse if you notice it
- cellulitis - a skin infection that can appear as redness of the skin that might be tender and swollen
Rare side effects
This can happen to fewer than 1 in 100 people (fewer than 1%). Let your doctor or nurse know straight away if your skin becomes very red, painful, swollen and starts to peel.
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.
In particular tell your doctor, nurse or pharmacist if you are taking:
- vitamins or vitamin supplements
- medication to thin your blood and stop it clotting such as warfarin and heparin
Loss of fertility
Raltitrexed can affect the production of sperm. But it should go back to normal 3 months after finishing treatment.
Contraception and pregnancy
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 6 months afterwards. Talk to your doctor or nurse about effective contraception before starting treatment.
Don’t breastfeed during this treatment because the drug may come through into your breast milk.
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)
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. 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.