Patient Safety Network (页面存档备份,存于互联网档案馆) - includes a glossary and articles on adverse effects, drug reactions, medical error, iatrogenesis, among others.
Medical Product Safety Information (页面存档备份,存于互联网档案馆) - MedWatch lists safety alerts for drugs, biologics, devices and dietary supplements, recalls, market withdrawals, public health advisories and links
Medical Devices Safety (页面存档备份,存于互联网档案馆) National Library of Medicine (Medline Plus, useful lists of conventional drug and medical device articles and websites)