Find out what lapatinib is, how you have it and other important information about taking lapatinib for advanced breast cancer.
Lapatinib is a targeted cancer drug (biological therapy) and is also known by its brand name, Tyverb. In North America it is called Tykerb.
It is a treatment for advanced breast cancer that have large amounts of a protein called human epidermal growth factor receptor 2 (HER2). Researchers are also looking at using it to treat other types of cancer.
You may have it with another drug. This might be one of the following:
- a type of chemotherapy called capecitabine
- trastuzumab (Herceptin)
- hormone therapy
How you have lapatinib
You have lapatinib as tablets.
Taking your tablets or capsules
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.
Talk to your specialist or advice line before you stop taking a cancer drug.
You take them a glass of water, either an hour before or an hour after food.
If you miss a dose, don't take an extra dose to catch up. Just take your next dose at the scheduled time.
When you have it
You take the tablets once a day. If you miss a dose, don't take an extra dose to catch up. Just take your next dose at the scheduled time.
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.
Other medicines, foods 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 treatment might harm a baby developing in the womb. It is important not to become pregnant or father a child while you're having treatment and for a few 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.
You are more at risk of developing a blood clot during treatment. Drink plenty of fluids and keep moving to help prevent clots.
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.
Grapefruit and grapefruit juice
You should not eat grapefruit or drink grapefruit juice when you are taking this drug because it can react with the drug.
More information about this treatment
We haven't listed all the very rare side effects of this treatment. For further information see the electronic Medicines Compendium (eMC) website.
You can report any side effect you have that isn’t listed here to the Medicines Health and Regulatory Authority (MHRA) as part of their Yellow Card Scheme.