Drug InfoNet - Information on drugs and interactions.

Healthtouch Online - Information on prescription and over-the-counter drugs.

MayoClinic.com - Drug information for the consumer.

RX List - Searchable by keyword, interactions, or brand names.

Drug Abuse
National Institute on Drug Abuse - Information on common drugs of abuse.

Drug-Free Resource Net - Information of drugs and drug abuse prevention methods. A searchable database on illegal drugs, names, effects, symptoms of drugs.

National Clearinghouse of Alcohol and Drug Information - Information on alcoholism and drug abuse.