The WHO Model Lists of Essential Medicines has been updated every two years since 1977. The current versions are the 18th WHO Essential Medicines List and the 4th WHO Essential Medicines List for Children updated in April 2013. ADULTS -- 18th edition (April 2013) -- Rev. Oct.2013 http://apps.who.int/iris/bitstream/10665/93142/1/EML_18_eng.pdf?ua=1 CHILDREN -- 4th edition (April 2013) -- Rev. Oct.2013 http://apps.who.int/iris/bitstream/10665/93143/1/EMLc_4_eng.pdf?ua=1
