Targeted drugs for lung cancer generally need to be taken for a long time as long as they are effective and the patients can tolerate the side effects, and there are obvious individual differences in the specific time of taking them, some of which are a few months and some of which are a few years. Targeted drugs for lung cancer are mainly used in the treatment of advanced lung cancer, and generally, according to the different types of mutated genes of each patient, targeted drugs are chosen for treatment. Targeted drugs are generally taken for a long time until the patients’ disease progression occurs due to the resistance to the targeted drugs or the intolerable side effects of the drugs occur. Since there are obvious individual differences in the time when each lung cancer patient becomes resistant to the targeted drugs, and the physical condition of each patient is different, and there are obvious differences in the tolerance of the targeted drugs, the specific time of taking the targeted drugs also varies significantly, ranging from a few months to a few years. Please strictly follow the doctor’s instructions, do not self-medication.