Drug-related sites were found by initially performing an Internet search on “psychoactive drugs” and then exploring links among the sites identified. Sites were chosen on the basis of comprehensiveness of information and positive or tolerant attitude toward drug use. While the sites discuss all classes of drugs, they focus primarily on synthetic and naturally occurring hallucinogens. Many of the biological materials discussed are legal and readily available. Information surveyed at these sites was largely accurate regarding the effects of various substances and biological sources of psychoactive compounds. The article concludes that Internet drug information libraries contain large amounts of information about a wide variety of drugs, including previously little-known biological sources of hallucinogens, and that the availability of this information could have significant effects on patterns of drug use. References