Infection, disease & health
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To identify and estimate the usage of unregistered antimicrobial drugs in Australian clinical practice. ⋯ The use of unregistered antimicrobials in Australian clinical practice is not uncommon. With increasing antimicrobial resistance, there will be a continued reliance on older less-used antimicrobial agents and an increasing need for novel drugs, therefore regulatory pathways need to facilitate security of supply and assurance of medicine quality and safety.