After immunisation for common childhood illnesses, appropriate use of essential medicines is one of the most cost-effective components of modern health care.2 In 1977, the World Health Organization (WHO) launched its first list of essential medicines. The model list was designed to prioritise the most important medicines for public health and was the centrepiece of a strategy to enhance their availability, especially in less-developed countries.3 Essential medicines lists (EMLs) give priority status to medicines that address a country��s most pressing public health problems��they are a vital tool for improving and maintaining health.
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