• Yuki Kimura, Haruhisa Fukuda, Kayoko Hayakawa, Satoshi Ide, Masayuki Ota, Sho Saito, Masahiro Ishikane, Yoshiki Kusama, Nobuaki Matsunaga, and Norio Ohmagari.
• AMR Clinical Reference Center, National Center for Global Health and Medicine, Tokyo, Japan.
• Plos One. 2019 Jan 1; 14 (10): e0223835.

BackgroundInappropriate antibiotic prescribing is a cause of antimicrobial resistance. Acute Respiratory Tract Infections (ARTI) are common diseases for those antibiotics are most likely prescribed in outpatient setting.ObjectivesTo clarify factors associated with antibiotic prescribing for non-bacterial acute respiratory tract infections (NB-ARTI) and identify targets for reducing inappropriate prescribing for NB-ARTI in Japan.MethodsWe conducted a retrospective, observational study using longitudinal claims data between April 2012 and June 2017. We assessed the rate of and factors associated with inappropriate antibiotic prescribing in outpatient settings for all NB-ARTI consultations included in the database.ResultsThe mean monthly antibiotic prescribing rate per 100 NB-ARTI consultations during the study period was 31.65. The monthly antibiotic prescribing rate per 100 NB-ARTI consultations decreased by 19.2% from April 2012 to June 2017. Adolescents (13-18 years) and adults of working age (19-29 and 30-39 years) were more likely prescribed antibiotics compared with elderly patients ≥ 60 years (aOR: 1.493 [95%CI: 1.482-1.503], 1.585 [95%CI: 1.575-1.595], and 1.507 [95%CI: 1.498-1.516], respectively). Outpatient clinics registered as internal medicine or ear, nose, and throat specialty were more likely to prescribe antibiotics than those of paediatric specialty or other specialties. Among health facility type, clinics without beds (aOR 2.123 [95%CI: 2.113-2.133]) and clinics with beds (aOR: 1.752 [95%CI: 1.7371-1.767]) prescribed significantly more antibiotics for NB-ARTI than outpatient departments inside general hospitals.ConclusionsInappropriate antibiotic prescribing for NB-ARTI is common in Japan. Although the antibiotic prescribing rate has decreased, further interventions are required to promote antimicrobial stewardship (ASP). Education and awareness for adults and promotion of ASP among physicians in clinics without beds are key drivers to reduce inappropriate antibiotic prescribing in Japan.

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