Gefcy 250 Tablet is primarily used for cancer treatment It targets the epidermal growth factor receptor EGFR found in both normal and cancer cells disrupting signals necessary for cancer cell growth Gefitinib a cancer medication is specifically used to treat certain types of cancers by inhibiting cancer cell growth It targets the EGFR in healthy and cancerous cells interrupting communication pathways essential for cancer cell growth and survival It is important to follow the prescribed dose and duration as directed by the doctor Common side effects include diarrhea dry skin loss of appetite nausea rash mouth inflammation vomiting weakness and weight loss It is associated with an increased risk of interstitial lung disease so patients should be monitored for symptoms such as cough difficulty breathing and fever If a dose is missed take it when remembered but do not double doses Consult the doctor for guidance on managing missed doses effectively