Consumer Drug Information, from the U.S. Food and Drug Administration, provides information sheets about prescription drugs that have been approved by the FDA since January 1998.
Drug Informationfrom MedlinePlus provides information on thousands of prescription and over-the-counter medications.
Rite Aid Drug Advisor and Drug Interactions Tool that includes over the counter drugs and herbs and vitamins. Eckerd OnCall is a free health information hotline staffed by a team of specially-trained pharmacy counselors you can access by phone or internet.