As a public good, antimicrobial medicines require rational use if their effectiveness is to be preserved. However, up to 50% of antibiotic use is inappropriate, adding considerable costs to patient care, and increasing morbidity and mortality. In addition, there is compelling evidence that antimicrobial resistance is driven by the volume of antimicrobial agents used. High rates of antimicrobial resistance to common treatments are currently reported all over the world, both in health care settings and in the community. For over two decades, the Region of the Americas has been a pioneer in confronting antimicrobial resistance from a public health perspective. However, those efforts need to be stepped up if we are to have an impact on antimicrobial resistance and want to quantify said impact.