The 19th WHO Model List of Essential Medicines is freely available here:

http://www.who.int/medicines/publications/essentialmedicines/EML2015_8-May-15.pdf

‘Increasingly, governments and institutions around the world are using the WHO list to guide the development of their own essential medicines lists, because they know that every medicine listed has been vetted for efficacy, safety and quality, and that there has been a comparative cost-effectiveness evaluation with other alternatives in the same class of medicines…’

http://www.who.int/medicines/news/eml_2015/en/

Best wishes,

Neil

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