Ask a Patient 
Provides a database of patient opinions and ratings of medicine effectiveness. Also includes weekly consumer opinion polls on healthcare topics, and a health care research assistance section.
http://www.askapatient.com/American Medical Association Guidelines for Medical and Health Information Sites on the Internet 
Principles governing the production and publication of AMA sites on the Web. Guidelines focus on providing quality and reliable information for consumers.
http://www.ama-assn.org/ama/pub/category/1905.html
Buying Prescription Medicines Online: A Consumer Safety Guide 
Offers basic do's and don'ts for buying prescription medicine online. Produced by the US Food and Drug Administration.
http://www.fda.gov/cder/consumerinfo/buyOnlineGuide.htm
The Consumer Health Information Centre (CHIC) 
General health tips and advice to help consumers overcome illnesses.
http://www.chic.org.uk/