MedlinePlus

MedlinePlus has extensive information from the National Institutes of Health and other trusted sources on over 590 diseases and conditions. There are also lists of hospitals and physicians, a medical encyclopedia and dictionaries, health information in Spanish, extensive information on prescription and nonprescription drugs, health information from the media, and links to thousands of clinical trials.

Coverage: updated daily

http://www.nlm.nih.gov/medlineplus/

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