National Library of Medicine.
Links to many good subsidiary sites.
Best starting point.
Reliable information selected by professionals.
Very comprehensive information on medical conditions.
Recommended, although sometimes highly technical.
Unbiased and thorough.
Requires registration.
Confusing to navigate and covers only the most common drugs.
Some good information but heavily loaded with ads,
including pop-up windows.
Alternate FDA site.
Lots of good information, but buried among advertising.
Not much practical information.
Look at
Life
Extension Discounts.
Info on peripheral vascular disease.