Geftistar 250mg Tablet is primarily prescribed for cancer treatment It targets epidermal growth factor receptor EGFR in both normal and cancer cells disrupting signals necessary for cancer cell growth Gefitinib a cancer medication inhibits cancer cell growth by targeting EGFR found in healthy and cancerous cells By blocking specific proteins associated with this receptor Gefitinib disrupts the communication pathways crucial for cancer cell growth and survival It is recommended to follow the prescribed dose and duration as directed by the doctor Common side effects include diarrhea dry skin loss of appetite nausea rash stomatitis vomiting weakness and weight loss There is an increased risk of interstitial lung disease and patients should be monitored for symptoms such as cough difficulty breathing and fever Prompt medical attention is necessary if these symptoms occur If a dose is missed take it when remembered and consult the doctor for guidance on managing missed doses effectively