Dabrafenib (Tafinlar) | Cancer Research UK
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What dabrafenib is

Dabrafenib is a type of biological therapy drug called a cancer growth blocker. It is also known by its brand name Tafinlar.

Dabrafenib is a treatment for people with melanoma skin cancer that has spread to other parts of the body or can't be removed with surgery.


How debrafenib works

About half of all melanoma skin cancers make too much BRAF protein due to a change in the BRAF gene. The BRAF protein makes cells grow and divide. Debrafenib stops cells producing the BRAF protein so this treatment can slow or stop the growth of the cancer. 

Dabrafenib only works for people who have a change in the BRAF gene. Your doctor will take samples of the melanoma to see whether this treatment is suitable for you. 


How you have dabrafenib

Dabrafenib comes as tablets. You take them twice a day, 12 hours apart. The normal dose is two tablets. You shouldn't take dabrafenib with food. After taking dabrafenib you should wait at least 1 hour before you eat. If you are taking it after eating you must wait at least 2 hours before you take it. Swallow the tablets whole with a glass of water. Don't crush or chew them.

It is very important that you take tablets according to the instructions your doctor or pharmacist gives you. For example, whether you have a full or empty stomach can affect how much of a drug gets into your bloodstream. You should take the right dose, not more or less. And never stop taking a cancer drug without talking to your specialist first. 

You usually carry on taking dabrafenib for as long as it works. You may have it in combination with another cancer drug called trametinib.

If you forget to take dabrafenib, take it as soon as you remember if it is less than 6 hours late. If it is more than 6 hours late, skip that dose and take your next dose at the usual time.

If you take more dabrafenib than you should, contact your doctor, nurse or pharmacist for advice straight away. 


Tests during treatment

You have blood tests before starting treatment and regularly during your treatment. The tests check your levels of blood cells and other substances in the blood. They also check how well your liver and kidneys are working.

Your doctor will check your eyes regularly while you are having this treatment. They will check your skin every month during treatment and for 6 months afterwards. 

You may also have CT scans to check your head, neck, mouth and lymph glands. Women have genital examinations before and after treatment and men and women have examinations of the skin around the back passage (anus).


About side effects

We've listed the side effects associated with dabrafenib. You can use the links to find out more about each side effect. Where there is no link, please go to our information about cancer drug side effects or use the search box at the top of the page.

You may have a few side effects. They may be mild or more severe. A side effect may get better or worse through your course of treatment. Or more side effects may develop as the course goes on. This depends on

  • How many times you've had the drug before
  • Your general health
  • The amount of the drug you have (the dose)

The side effects may be different if you are having dabrafenib with other medicines.

Tell your doctor or nurse straight away if any of the side effects get severe.


Common side effects

More than 10 in every 100 people have one or more of these side effects.

  • Skin changes – this may include a rash or red, dry, itchy skin or small wart like growths
  • Soreness, redness and peeling on the palms of the hands and soles of the feet (palmar-planter syndrome), which may cause tingling, numbness, pain and dryness
  • Skin thickening
  • Headaches
  • Feeling or being sick – this is usually well controlled with anti sickness medicines
  • Diarrhoea – drink plenty of fluids and tell your doctor or nurse if you are worried or if the diarrhoea continues for more than a couple of days
  • Loss of appetite
  • Feeling weak and low in energy
  • A raised temperature (fever)
  • Joint pain, muscle pain or pain in your hands and feet
  • A cough
  • Eyesight changes – don't drive or operate machinery if you have eyesight changes such as blurred vision
  • Hair loss or thinning 
  • Tiredness during and after treatment
  • Loss of fertility – you may not be able to become pregnant or father a child after having this treatment. Talk to your doctor before starting your treatment if you think you will want to have a baby in the future. Men may be able to store sperm before starting treatment

Occasional side effects

Between 1 and 10 in every 100 people have one or more of these side effects.

  • Constipation – your doctor or nurse may give you medicines to help prevent this but tell them if you are constipated for more than 3 days
  • Flu like symptoms – you may have fever, chills and muscle aches but taking paracetamol can help
  • Raised blood sugar levels – you may not have any symptoms from this but you will have regular blood tests to check the levels
  • Changes to your heart and how it pumps blood around your body – your doctor will check your heart before and after your treatment. Tell them if you can feel your heart pounding or beating irregularly, or if you feel dizzy or lightheaded, or have breathlessness or swollen legs
  • New skin cancers, including squamous cell cancers, basal cell cancers and new melanomas – let your doctor know if you notice any skin changes
  • Changes in your blood chemistry – the levels of phosphorus in your blood may be higher than normal. You won't usually have any symptoms from this
  • Bleeding into the brain, stomach or bowel – tell your nurse or doctor straight away if you have sudden headaches, dizziness, feel unwell, dark poo, blood in your urine, stomach pains or if you cough up blood

Rare side effects

Fewer than 1 in 100 people have these side effects.

  • Kidney changes that are mild and unlikely to cause symptoms – they will almost certainly go back to normal when treatment is finished
  • Stomach pain caused by inflammation of your pancreas (pancreatitis) – let your doctor know if you have strong abdominal pains
  • Eye problems, including blurred vision, redness, irritation, pain, floating spots before your eyes and sensitivity to light – let your doctor or nurse know if you have any of these

Important points to remember

Talk to your doctor, pharmacist or nurse about all your side effects so that they can help you manage them. They can give you advice or reassure you. Your nurse will give you a contact number to ring if you have any questions or problems. If in doubt, call them.

Other medicines

Tell your doctor about any other medicines you are taking, including vitamins, herbal supplements and over the counter remedies. Some drugs can react together.

Contraception and pregnancy

This drug may harm a developing baby. It is not advisable to become pregnant or father a child during treatment. It is important to use reliable contraception while having the drug and for one month afterwards. Talk to your doctor or nurse about contraception before starting treatment.


Don't breastfeed during this treatment because the drug may come through the breast milk.



You should not have immunisations with live vaccines while you are having treatment or for at least 6 months afterwards. In the UK, these include rubella, mumps, measles (usually given together as MMR), BCG, yellow fever and Zostavax (shingles vaccine).

You can have other vaccines, but they may not give you as much protection as usual until your immune system has fully recovered from your treatment. It is safe to have the flu vaccine.

It is safe for you to be in contact with other people who've had live vaccines as injections. There can be problems with vaccines you take by mouth (oral vaccines) but not many people in the UK have these now. So there is usually no problem in being with any baby or child who has recently had any vaccination in the UK. You might need to make sure that you aren't in contact with anyone who has had oral polio, cholera or typhoid vaccination recently, particularly if you live abroad. 


Related information 


More information about dabrafenib treatment

We don't list all the very rare side effects of this treatment that are very unlikely to affect you. For further information look at the Electronic Medicines Compendium website at www.medicines.org.uk/emc.

If you have a side effect we don't mention here and you think may be due to this treatment, you can report it to the Medicines Health and Regulatory Authority (MHRA) at yellowcard.mhra.gov.uk.

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Updated: 8 December 2015