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Lapatinib Ditosylate

This page contains brief information about lapatinib ditosylate and a collection of links to more information about the use of this drug, research results, and ongoing clinical trials.

US Brand Name(s)
FDA Approved

FDA label information for this drug is available at DailyMed.

Use in Cancer

Lapatinib ditosylate is approved to be used with other drugs to treat:

  • Breast cancer that is advanced or has metastasized (spread to other parts of the body). It is used with:
    • Capecitabine in women with HER2 positive (HER2+) breast cancer whose disease has not gotten better with other chemotherapy.
    • Letrozole in postmenopausal women with HER2+ and hormone receptor–positive (HR+) breast cancer who need hormone therapy.

Lapatinib ditosylate is also being studied in the treatment of other types of cancer.

More About Lapatinib Ditosylate

Definition from the TCH Drug Dictionary – Detailed scientific definition and other names for this drug.

MedlinePlus Information on Lapatinib Ditosylate – A lay language summary of important information about this drug that may include the following:

  • warnings about this drug,
  • what this drug is used for and how it is used,
  • what you should tell your doctor before using this drug,
  • what you should know about this drug before using it,
  • other drugs that may interact with this drug, and
  • possible side effects.

Drugs are often studied to find out if they can help treat or prevent conditions other than the ones they are approved for. This patient information sheet applies only to approved uses of the drug. However, much of the information may also apply to unapproved uses that are being studied.