Helps you:

• Treat patients exposed to toxic substances
• Safely handle substances in the laboratory
• Find out where you may be exposed to toxic substances

(Toxicology Data Network) is a system of freely available files oriented to toxicology and related areas. 

• Chemical synonyms, structures, safety & handling, laboratory methods
• emergency medical treatment, health effects, pharmacology
• regulatory list information
• environmental fate, environmental health maps
• toxicology literature search

Resources available include:

• Toxicology Data Search provides access to HSDB (Hazardous Substance Data Bank)
• CCRIS (Chemical Carcinogenesis Research Information System)
• CPDB (Carcinogenic Potency Database)
• GENE-TOX (Genetic Toxicology)
• IRIS (Integrated Risk Information System). 
• EPA's TRI (Toxic Chemical Release Inventory)
• DART (Development and Reproductive Toxicology)
• EMIC (Environmental Mutagen Information Center)
• TOXLINE.