Created by the National Library of Medicine, this web-based search system provides the structure, nomenclature, molecular formula, CAS registry number, toxicity, and physical properties for chemical substances.
Drug Information Portal
Provided by the National Library of Medicine, this site gives quick access to comprehensive information on a large selection of drugs.
This Food and Drug Administration (FDA) database includes information on approved and tentatively approved prescription, over-the-counter, and discontinued drugs.
Environmental Health and Toxicology
This comprehensive toxicology and environmental health portal includes links to databases, bibliographies, tutorials, and other scientific and consumer-oriented resources. The resources available through this site include a Drugs and Lactation Database (LactMed), Hazardous Substances Data Bank (HSDB), Carcinogenic Potency Database (CPDB), and much more.
Household Products Database
This database provides health and safety information on numerous household products. Information in the Household Products Database is taken from a variety of publicly available sources, including brand-specific labels and Material Safety Data Sheets prepared by manufacturers.
MedlinePlus: Drugs & Supplements
This excellent resource provides thorough, easily understood information on prescription drugs, over-the-counter drugs, and herbs and supplements.