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Steroids for brain tumours

Following a brain tumour diagnosis, it’s likely that you’ll be given steroids at some point during your treatment.

The steroids used during brain tumour treatment are corticosteroids. These are NOT anabolic steroids, which are used by some athletes to build muscle.

What are steroids?

Steroids are hormones that are produced naturally in our bodies in small amounts. They help to control swelling when our body is injured.

Sometimes our bodies don’t produce enough steroids to reduce the swelling. Fortunately, steroids created in a laboratory for medical purposes can be given in these cases.

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Before steroids

Brain cells in and around a tumour, or the area treated by surgery or radiotherapy, can swell and put pressure on surrounding tissues. This can cause symptoms, such as headaches and seizures. 

Steroids help with symptom management rather than treating the tumour itself. So, you may be given steroids after diagnosis, or before or after these treatments to reduce the swelling and relieve those symptoms.

You may also be given a low dosage of steroids if you’re having chemotherapy or radiotherapy and feeling sick.

Asking questions

Your healthcare team will also talk through what will happen and discuss any potential side-effects with you before any treatment is given.

This is your chance to ask any questions. Remember, no question is a silly question.

It can also help to find out who you should contact and how to reach them if you have any questions or concerns at a later time.

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Make the right choices for you

Our Step by Step interactive guide outlines what happens following a diagnosis, to answer your questions and help you to understand what to expect.

While taking steroids

The steroid most commonly used with brain tumours is dexamethasone. Steroids are fast-acting drugs, so the effects caused by the tumour can reduce quite quickly.They may need to be taken at set times of day.

Steroids can be taken:

Tablets are the most common way to take steroids. If you have difficulty swallowing tablets, try practising with tic tacs®. 

The colour and dosage of the tablet/medicine will depend on which steroid you’ve been prescribed.

Steroids are only likely to be given by injection when you’re in hospital or if you’re unable to take tablets by mouth.

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Taking steroids

Jennifer talks about using steroids during her brain tumour treatment.

I felt so bloated and heavy from the steroids, I didn’t recognise myself anymore.

Monitor your steroid side-effects

Steroids, like any medication, can cause a variety of side-effects. But if you experience any, you should talk to your doctor. Use BRIAN’s quality-of-life tracker to record and monitor them, then share this with your healthcare team so they can support you.

After taking steroids

As with many medications, steroids affect different people in different ways. Their effect will also depend on the exact type and dosage of steroid prescribed for you. Talk to your healthcare team about any side-effects you experience.

Steroid side-effects

At the end of your treatment with steroids, your specialist is likely to reduce your dosage gradually.

This is because, after taking steroids for a few days, your body will be producing less of its own natural steroids. Your body needs some steroids, and reducing the dosage of your medical steroids allows your body to start producing its own again.

You should never stop taking your steroids suddenly or reduce your dosage unless your specialist advises you to. It can make you very unwell.

Always make sure you have enough tablets on repeat prescription, by talking to your GP. 

If steroids don’t work

Although treatment plans are carefully developed by healthcare professionals to be as effective as possible while having the fewest risks or side-effects, sometimes steroids might not work. 

This can be worrying, but just because one treatment hasn’t worked, it doesn’t mean others won’t.

Find out more

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Tips from our community

“Steroids gave me a massive appetite and constipation – not a nice combination! I’d suggest taking laxatives and stool softeners as soon as you begin the steroids, as this really helped me.”

“Coming off steroids has to be managed really carefully, as the side effects can be horrendous for some people. My son reduced his dosage gradually with the help of his medical team and this has helped make it a lot easier.”

“Reducing steroid dosage is an art form in itself! I think the rule of thumb is if you start reducing and get any symptoms, then you should put it up again for a while and then try reducing the dose much more slowly. But your medical team should be able to advise on that.”

“When I was on steroids I had a huge appetite and couldn’t stop eating. Even when I was full! But as soon as I started coming off them I lost all the weight I’d put on. They are a necessary evil and whilst I hated the weight, overall they made me feel much better and prevented further damage to my brain.”

By joining one of our Online Support Communities, you can get more tips about living with or beyond a brain tumour diagnosis from people who truly understand what you’re going through.

Find out more


Frequently asked questions

Steroids are usually given in short courses of a few days or a few weeks. Keep taking your steroids for as long as your specialist tells you to.

If you have to take steroids for longer than a week, you’re likely to be given a steroid card.

It has important information about your type and dosage of steroid, which may be needed in an emergency.

Carry it with you at all times.

Your doctor may advise carrying it for up to a year after your steroid treatment has ended.

You should make every effort to remember to take your steroids when you’re required to. Leave yourself a note or set an alarm to remind you. Getting into a routine of when you take your steroids is also helpful.

If you do miss a dose, do NOT try to compensate by taking a double dose next time. Similarly, if you are sick shortly after taking a tablet, don’t take another dose.
In these cases, speak to your healthcare team to see what they advise.


More information

Treating brain tumours with steroids factsheet – PDF

Find out more about steroids in the full fact sheet.

Treating brain tumours with steroids – Clear print factsheet – PDF

Find out more about steroids in the full fact sheet – Clear print version, designed to RNIB guidelines.


If you have further questions, need to clarify any of the information on this page, or want to find out more about research and clinical trials, please contact our team:
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