Pharmacist-led multi-faceted intervention in an antimicrobial stewardship programme at a dental university hospital in Japan

Background: Antimicrobials are commonly prescribed in dentistry. However, inappropriate antimicrobial prescriptions are common in this field. Optimizing antimicrobial prescriptions in dentistry requires an effective strategy for modifying prescribing behaviour.Aim: To assess the efficacy of pharmacist-led multi-faceted intervention for the proportion of monthly antimicrobial prescriptions in each drug group per 100 oral antimicrobial prescriptions.Methods: A before-after trial was performed at a university hospital outpatient dental clinic. A pharmacist-led, multi-faceted intervention, including immediate and direct feedback to the prescribers, an explanation of the rules of antimicrobial prescriptions for patients with pen-icillin allergy, tutorials for dentistry students, and a review of hospital-approved antimicrobials, was implemented from April 2017 to March 2022. Antimicrobials were classified into eight groups, namely, penicillins, first-and second-generation cephalosporins, third-generation cephalosporins, fluoroquinolones, macrolides, clindamycin, carbapenem, and others.Findings: In total, there were 2,643,988 visits to the outpatient dental clinic during the study period. The monthly mean proportion of prescriptions for penicillins increased from 45.6 to 84.1 per 100 oral antimicrobial prescriptions (P<0.001) while that of third -generation cephalosporins decreased from 43.0 to 7.3 (P<0.001) from the pre -intervention to the intervention period. Moreover, the monthly mean proportion of fluo-roquinolones, macrolides, and carbapenems decreased from 11.2 to 7.44 (P<0.001).Conclusion: The intervention modified dentists' antimicrobial prescribing behaviours, leading to an immediate increase in the number of monthly prescriptions for penicillins and a simultaneous decrease in the number of monthly prescriptions for third-generation cephalosporins and other broad-spectrum, oral antimicrobials.(c) 2023 The Healthcare Infection Society. Published by Elsevier Ltd. All rights reserved.