There are three main factors that separate a healthy population from one riddled with disease: good food, clean water, and essential medicine.
While all medications serve a purpose, only some are considered essential. Essential medicines fulfill the highest public health priorities. The World Health Organization (WHO) has maintained a list of essential medicines since 1977. These medications are selected based on the prevalence of the diseases they treat, evidence of their efficacy and safety, and their cost-effectiveness. Due to their critical importance, essential medicines should be available at affordable costs in functioning health systems at all times.





