What is lapatinib used for? Description. Lapatinib is used in combination with capecitabine to treat advanced or metastatic (cancer that has already spread) HER2-receptor positive breast cancer in patients who have received other cancer treatments (eg, anthracycline, taxane, trastuzumab) that did not work well. https://indiangenericprice.com/lapatinib-tykerb-cost-india