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WORLD HEALTH ORGANIZATION (WHO) Model List of Essential Medicines
The WHO Model List of Essential Medicines has been updated every two years since 1977. The current version, the 20th list, dates from March 2017.
20th Edition (March 2017)
19th Edition (April 2015)
18th Edition (April 2013)
17th Edition (March 2011)
16th Edition (March 2009)
15th Edition (March 2007)
14th Edition (March 2005)
13th Edition (April 2003)
12th Edition (April 2002)
WHO Model List of Essential Medicines for Children 2011- 3rd Edition.