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Diseases

Diseases, Disorders and Related Topics
Thousands of links and lots of information on individual diseases. Searchable database.
MEDLINEplus: Health Topics
Easy-to-use databse of diseases.
The Merck Manual
Searchable database online. Every disease known.
National Institute of Health
What's new in the world of medicine and health? Start here! 

Drugs

Common Drugs of Abuse Information Index
Thorough database on commonly abused drugs.
Fact Sheets
Various fact sheets about commonly abused drugs.
Drugs
Another fact sheet, this one is fairly thorough.
National Institute on Drug Abuse
Searchable database on all the drugs that are commonly abused. Official information, up-to-date.
Society's Commonly Abused Drugs
Fact sheet on commonly abused drugs.