Lapatinib Tablet offered is made available under brand name Tykerb and is offered in 250mg tablet form. Made available in yellow solid form with solubility in water, it is used with for treatment of certain type of advanced breast cancer in people already treated with other chemotherapy medication. As a class of medication called kinase inhibitors, the medication works by blocking action of abnormal protein which signals cancer cells to multiply, thus stoppingslowing spread of cancer cells