European Medicines Agency (EMEA)
http://www.emea.eu.int/home.htm
European portal of all European national agencies
http://www.heads.medagencies.org
U.S. Food and Drug Administration
http://www.fda.gov/
Japanese Pharmaceutical and Medical Device Agency (PMDA)
http://www.info.pmda.go.jp/shinyaku/shinyaku_index.html