Geftinat contains gefitinib and belongs to a class of anti-cancer medications called epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors.Geftinat is used for the treatment of non-small cell lung cancer. GEFITINIB is a chemotherapy drug. It targets a specific enzyme within cancer cells and stops the cancer cells from growing. It is used to treat advanced non-small cell lung cancer. Dosage Take this medicine by mouth with a full glass of water.