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  • Basic Info
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Generic: lapatinib
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It targets specific enzymes within cancer cells and stops the cancer cells from growing

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What is this medicine?

LAPATINIB (la PA ti nib) is a chemotherapy drug. It targets specific enzymes within cancer cells and stops the cancer cells from growing. This medicine is used to treat some advanced breast cancers. It is often used along with other cancer treatments.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:
  • heart disease
  • heart rhythm problems (irregular heartbeat)
  • high blood pressure
  • history of low levels of potassium or magnesium
  • liver disease
  • an unusual reaction to lapatinib, other medicines, foods, dyes, or preservatives
  • pregnant or trying to get pregnant
  • breast- feeding

How should I use this medicine?

Take this medicine by mouth with a glass of water. Take this medicine on an empty stomach, at least 1 hour before or after a meal. Do not take with food. Follow the directions on the prescription label. Do not take your medicine more often than directed. Do not stop taking except on your doctor's advice.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed. This medicine is not approved for use in children.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

What may interact with this medicine?

Do not take this medicine with any of the following:
  • grapefruit or grapefruit juice

This medicine may also interact with the following medications:

  • antiviral medicines for HIV or AIDS
  • cisapride
  • clarithromycin
  • cyclosporine
  • daunorubicin
  • dexamethasone
  • diltiazem
  • doxorubicin
  • erythromycin
  • medicines for depression, anxiety or psychotic disturbances
  • medicines for fungal infections itraconazole, ketoconazole
  • medicines for irregular heart beat
  • medicines for seizures like carbamazepine, phenobarbital, phenytoin
  • rifabutin, rifampin, rifapentine
  • St. John's Wort or other herbal supplements
  • stomach acid blockers like cimetidine, famotidine, ranitidine, or omeprazole
  • telithromycin
  • verapamil

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