Gefitinib tablets are targeted therapeutic agents. The exact length of life after taking the drug depends on the patient’s specific condition and tolerance, and cannot be generalized. Generally speaking, if a patient develops drug resistance within a few months after taking Gefitinib tablets orally, the disease cannot be effectively controlled and the cancer will continue to progress and the life expectancy will be shortened. However, there are patients who develop resistance after taking the drug for 2-3 years or more, which in turn effectively halts the progression of cancer and prolongs life expectancy. Some clinical reports have shown that patients in the current cohort of patients who have survived 10 years of oral treatment with the drug by taking gefitinib. Therefore, the length of time you can live on Gefitinib varies from person to person. If drug resistance does not occur, it is recommended to strictly follow the medical advice and adhere to the medication, and during the period of taking the medication, you should also pay attention not to eat foods that affect the efficacy of the medication, such as grapefruit.