患者男,67岁。因慢性支气管炎并肺感染入院。入院时查WBC 7.1×10~9/L(N 0.84,L0.16)。为控制感染给青霉素G每日400万U静滴,氨苄青霉素(简称氨苄)6g/d,分2次静推。用药5d后复查WBC1.6×109/L(N 0.35,L0.65)。诊断为“粒细胞减少症”。因考虑与应用青霉素及氨苄有关,故停用上述二药而改用红霉素及庆大霉素。停药7d后WBC升554.8×109/L(N 0.70,L 0.30)。于第8天再次应用 Patient male, 67 years old. Due to chronic bronchitis and pulmonary infection admitted. WBC admission check 7.1 × 10 ~ 9 / L (N 0.84, L0.16). In order to control the infection to penicillin G daily 4 million U intravenous infusion, ampicillin (referred to as ampicillin) 6g / d, 2 times the static push. After 5 days of treatment, WBC1.6 × 109 / L (N 0.35, L0.65) was examined. Diagnosed as “neutropenia.” Due to the consideration and application of penicillin and ampicillin, it stopped using the above two drugs instead of erythromycin and gentamicin. After 7 days withdrawal WBC rose 554.8 × 109 / L (N 0.70, L 0.30). Reapply on the 8th day