In lung cancer, chemotherapy is the process of eliminating cancer cells with medication. Chemotherapy typically consists of two different drugs and can only be administered by nurses with specialized training in this area. The number of chemotherapy administrations is referred to as a 'cycle,' and these are generally repeated every 21-28 days. Chemotherapy for lung cancer is usually administered in fully equipped outpatient treatment centers, either as a liquid intravenously or as pills taken orally. In some cases, depending on the patient's deteriorating condition or the nature of the drugs used, chemotherapy may also be given on an inpatient basis. Following each chemotherapy cycle, patients are monitored regularly at the Medical Oncology outpatient clinic. During these check-ups, patients are examined, their complaints are heard, potential side effects of the medications are inquired about, and blood tests are requested to investigate any damage to other organs. A complete blood count must be performed before each cycle and the results shown to the authorized nurses administering the chemotherapy. Whether a patient will receive chemotherapy after surgery and the number of cycles they will receive are determined by the characteristics of the tumor in the pathology report. However, the patient's age and overall condition also play a significant role in these decisions. Patients whose general condition is so poor that they spend more than 12 hours a day in bed are not considered suitable for chemotherapy, as they may have low tolerance to side effects. For patients scheduled for chemotherapy, if they have undergone surgery, it is preferred to start chemotherapy within three weeks after the operation. Patients receiving their first chemotherapy should undergo a blood and general condition check-up at the Medical Oncology outpatient clinic approximately one week after the treatment. This check-up involves examining the patients' general condition, how they tolerate the treatment, and their blood test results, while listening to any complaints. Subsequent treatment cycles also involve reviewing the patient's blood work and general condition before each therapy session. Side effects of chemotherapy are evaluated, and dose adjustments may be made to the medication if necessary.