Health officials identified the antibiotic ciprofloxacin in a report on resistance to certain types of drugs in Scotland between 2004 and 2008.
Resistance to the drug is considered a "major threat to public health and patient safety", according to the Scottish Antimicrobial Prescribing Group.
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Hide AdIt said: "It is accepted that the way in which antimicrobials are used, sometimes inappropriately, will increase the risk of antimicrobial resistance developing."