Erlotinib is a medication used to treat various types of cancer. Some synonyms for the drug include Tarceva, Zykadia, and Afatinib. These medications are also classified as tyrosine kinase inhibitors, which work by blocking certain proteins in cancer cells to prevent their growth and spread. Another synonym for erlotinib is Epidermal Growth Factor Receptor (EGFR) Inhibitor, which refers to the mechanism by which the medication functions. Other EGFR inhibitors include Gefitinib and Cetuximab. Regardless of their specific name, these drugs are all used to treat cancer patients and can offer hope for those fighting the disease.