What Is The Drug Gefitinib Used For? Gefitinib is an anticancer medicine and it is used for the treatment of lung cancer. The brand medicine is Gefitero and it is an antineoplastic medicine. This medicine works by stopping the formation of proteins that signal the cancer cells to multiply. The side effects of Gefitinib are such as - diarrhea, fever, allergic reaction, sore throat, constipation, and breathing issues. The price of Gefitinib 250 mg Tablet is high hence it is advisable to gather complete information before buying. https://www.magicinepharma.com/tablet/gefitero-gefitinib