There are many medical websites which are fantastic for reading, knowledge and applied medicine. If you really stuck then use www.google.com and you will find what you want
MEDIC8.Health guide
Medical World Search Medical
A search engine that claims to link only to reputable health sites.
Medline
Medscape
National Library of Medicine
The Lancet
mdchoice.Medical search engine
Family Practice Notebook
eMedicine:Clinical Knowledge Base