抗菌药物在预防性应用方面常偏于滥用，许多情况下用药指征不明确，如医务人员为求安全，常在昏迷、休克、心力衰竭、气管切开等患者中应用药物以预防肺部感染，其结果可能更易获得耐药菌的继发感染。 内科领域内抗菌药物的预防性应用适用于：①防止风湿热复发，可采用苄星青霉 Antibiotics are often abused for preventive use. In many cases, the indication of the drug is not clear. For medical staff, for safety reasons, drugs are often used in patients with coma, shock, heart failure, and tracheostomy to prevent lung infections , The result may be more susceptible to secondary infections with resistant bacteria. Preventive use of antimicrobial agents in the field of medicine is suitable for: ① prevention of recurrence of rheumatic fever can be used Penicillium