MEDLINEplus Drug Information
Drug, supplement and herbal information from the AHFS Consumer Medication Information (prescription and over-the-counter information)and on herbs and supplements from the Natural Standard
CenterWatch Drug Directories
Offers a range of free, easy-to-search resources on drugs in various stages of development and approval .
A consumer health and drug information website from ExpressScripts, Inc. featuring a drug, vitamin and herbal library in addition to a drug interactions database
FDA's Center for Drug Information and Research
Features consumer drug information, over-the-counter drug information and information on clinical trials
RxList - The Internet Drug Index
Owned and operated by WebMD and part of the WebMD network.
Lists standards for prescription and over-the-counter medicines and other health care products manufactured or sold in the United States