Post-pandemic consumption of outpatient antibiotics in Switzerland up to pre-pandemic levels, 2018–2023: An interrupted time series analysis

Background: The COVID-19 pandemic has been a challenge for health-care systems and antibiotic stewards as uncertainty regarding treatment and bacterial coinfections raised concern. Methods: This retrospective observational study examined the association of the pandemic on outpatient antibiotic sales and prescriptions in Switzerland using interrupted time series (ITS) analyses. Data from IQVIA™ and the Sentinella Network were used to analyze antibiotic consumption and prescription patterns over a 72-month period from January 2018 to December 2023, divided into pre-pandemic, pandemic, and post-pandemic periods. Results: Antibiotic consumption decreased during the pandemic and returned to pre-pandemic levels in the post-pandemic period. A decrease in level was most pronounced in the French-speaking region (−2.82 defined daily doses per 1,000 inhabitants per day (DID) per month, 95 %CI [−4.34, −1.30], p < 0.001) and the Italian-speaking region (−2.80 DID per month, 95 %CI [−4.78, −0.82], p < 0.01), followed by the German-speaking region (−1.72 DID per month, 95 %CI [−2.71, −0.74], p < 0.01). Similarly, in the ITS, the relative change of model estimates in antibiotic prescriptions by GPs and pediatricians for upper respiratory tract infections, was of −36.0 % and −50.3 % resp. in the pandemic period and +10.1 % and −2.6 % in the post-pandemic period compared with the pre-pandemic period. Conclusions: A decrease of antibiotic prescriptions was observed in GPs and pediatricians during the COVID-19 pandemic, followed by a return to pre-pandemic levels. The patterns in antibiotic prescriptions aligned with the epidemiology of respiratory infections and demonstrated a pronounced association with the implementation and subsequent removal of non-pharmaceutical interventions.