Administration of ceftazidime shortened duration of neutropenia and hospitalization days in breast cancer patients who had infection after myelosupressive chemotherapy. Cost-effectiveness analysis (CEA) as one of pharmacoeconomic methods was important to determine treatment attaining effect for lower cost. The aim of this study was to compare the total direct medical cost and effectiveness, which was measured from length-of-stay (LOS), of generic ceftazidime A and B usage, and to decide which ceftazidime that was more cost-effective in early-stage and late-stage breast cancer patients at National Cancer Center Dharmais Hospital Jakarta year 2012. The study design was non-experimental with comparative study retrospectively on secondary data from medical records and administrative data in 2012. Samples were taken by using total sampling method. The number of samples were 9 patients, which included 7 patients with generic ceftazidime A and 2 patients with generic ceftazidime B. The total direct medical cost of generic ceftazidime A in early-stage and late-stage breast cancer patients, respectively Rp 15.930.407,45 and Rp 15.962.519,25, were higher than generic B, respectively Rp 6.716.225,21 and Rp 7.147.956,92. Median LOS of generic A ceftazidime in early-stage and late-stage breast cancer patients, respectively 7 days and 10 days, were longer than generic B, respectively 3 days and 4 days. According to CEA result, generic ceftazidime B was more cost-effective than generic A.