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Long-term antibiotic prescribing in the community: 6 years of Australian national data

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DOI: 10.1016/j.japh.2022.10.026

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This study describes the landscape of outpatient prescribing of long-term antibiotics in Australia. The results show that prolonged continuous antibiotics (> 12 months) were prescribed to 339/100,000 population, with 50% of patients aged more than 65 years. The frequently prescribed antibiotic classes were tetracyclines, sulfonamides/trimethoprim, cephalosporins, and penicillins. Prophylaxis of infection and immunomodulatory indications were the most common reasons for prescribing.
Background: Prolonged or indefinite courses of antibiotics are sometimes prescribed for suppression of chronic infection, prophylaxis, and noninfective indications. Little is known about long-term prescribing practices in the community. In Australia, 75% of outpatient pre-scribing is funded through the Pharmaceutical Benefits Scheme (PBS), a government program for subsidized medications. Objectives: To describe the landscape of outpatient prescribing of long-term antibiotics in Australia. Methods: We descriptively analyzed a randomized 10% sample of PBS prescription data from 2014 to 2020. Long term was defined as continuous prescribing 12 months or more. Patients were identified using a rolling window algorithm with 12-month look-back from each script provided. Results: Prolonged continuous antibiotics (> 12 months) were prescribed to 339/100,000 population; 50% of patients were aged more than 65 years and prescribing increased with age (1440/100,000 population in patients > 75 years). Frequently prescribed antibiotic classes were tetracyclines (43% of all long-term antibiotics), sulfonamides/trimethoprim (21%, pre-dominantly cotrimoxazole), cephalosporins (15%, predominantly cefalexin), and penicillins (13%). Prophylaxis of infection and immunomodulatory indications were most common. Pa-tients were co-prescribed analgesics (30%), antidepressants (30%), corticosteroids (20%), and immunosuppressive drugs (6%). Conclusion: Prolonged community prescribing of antibiotics is an important target for anti-biotic stewardship, particularly in older adults.(c) 2022 American Pharmacists Association (R). Published by Elsevier Inc. All rights reserved.

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