Gefitinib, a targeted medication frequently used for some forms of stage 4 lung cancer, particularly when there is an EGFR mutation, is a component of gefitero. It is typically given exactly as directed by the oncologist once a day, either with or without meals, and should be ingested with water at the same time every day. Diarrhoea, skin rash, mouth ulcers, appetite loss, nausea, dry skin, and weakness are typical adverse effects. If your grandma experiences severe dyspnea, yellow eyes, a high temperature, or worsening weakness, get in touch with the doctor very away since it can occasionally cause significant respiratory problems, liver problems, severe diarrhoea, or eye irritation. Blood testing and routine follow-up are crucial when using this medication.