Longitudinal trends in community antibiotic consumption in the Waitaha Canterbury Region of Aotearoa New Zealand over 10 years (2012-2021): an observational study.

AIMS: To investigate community antibiotic consumption in the Waitaha Canterbury Region of Aotearoa New Zealand across 2012-2021.

METHODS

This observational study was based on antibiotic dispensing data from Waitaha Canterbury. Outcome measures included number of dispensings/1,000 inhabitants per year and defined daily doses/1,000 inhabitants per day (DIDs), expressed as average annual change (AAC). We stratified antibiotic dispensing per antibiotic group, and per the World Health Organization (WHO) AWaRE (Access, Watch, Reserve) classification.

RESULTS

Across 2012-2021, antibiotic dispensing decreased from 867 to 601 dispensings/1,000 inhabitants (AAC -4.2% [95%CI -4.3 to -4.2]). In the pre-COVID period of 2012 to 2019, antibiotic dispensings decreased with AAC of -3.5% (95%CI -3.6 to -3.5). Considering number of dispensings, the largest reductions were observed in quinolones (-14.6%), macrolides/lincosamides (-8.5%) and penicillins with extended spectrum (-4.8%). The number of dispensings increased for nitrofurans (6.0%) and first generation cephalosporins (28.1%), of which 98% comprised cefalexin dispensing. The proportion of Watch antibiotics decreased from 22.0% to 11.9%.

CONCLUSIONS

Community antibiotic consumption decreased in Waitaha Canterbury Aotearoa New Zealand from 2012 to 2021, as did use of Watch antibiotics. These changes concord with increasing antimicrobial stewardship guidance for more judicious use of antibiotics. Further research should investigate the factors driving the observed 10-fold rise in cefalexin dispensing.