How does the WHO define essential medicines in relation to ASPs?

The World Health Organization (WHO) defines essential medicines as those that satisfy the healthcare needs of the population. This definition emphasizes the importance of medicines that are vital for meeting basic health requirements, particularly those that address priority health issues, including the management of infectious diseases with the use of antimicrobials.

By designating certain medicines as "essential," the WHO highlights the need for availability and accessibility, which is particularly relevant in the context of antimicrobial stewardship programs (ASPs). These programs aim to ensure that essential antimicrobials are used appropriately and effectively to contribute to improving patient outcomes while minimizing the development of resistance. Essential medicines, therefore, play a crucial role in health systems, especially in managing infections and preserving the efficacy of antimicrobials through responsible use.

In contrast, the other options do not align with the WHO's definition. Medicines that are obsolete do not meet current healthcare needs, non-essential healthcare needs would not qualify as critical for population health, and medications limited to developed countries would contradict the ethos of essential medicines being universally needed across different healthcare systems.