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MedlinePlus®

A service of the National Library of Medicine.

Resource Library

Explore this extensive array of third-party resources such as Medical References similar to those used by your physician, Interactive Learning tools to help you visualize your health, hundreds of Health News and Articles, and Support Resources for help and support.

Medical References

  • Health Encyclopedia

    Get clear, concise information on disease, injury, nutrition, medical tests, first aid, and more. Plus, it's loaded with illustrations to enhance your experience. (En Español)

  • Medical Dictionary

    Use the same medical dictionary that healthcare professionals have relied on for years. You'll find advanced definitions for over 115,000 medical terms.

  • The Merck Manual—Home Edition

    Access these essential health reference guides. Get in-depth information on all your health and medical concerns.

  • Over-the-Counter Drug Guide

    Consult this extensive guide to over-the-counter (OTC) medications.

Interactive Learning

Health News and Articles

  • Krames Education Articles

    These patient education materials have been used for over 30 years because they are written in simple, easy-to-understand text.

  • Harvard Health Reports

    Get up-to-date medical information from the experts at Harvard Medical School.

  • StayWell Custom Communications Articles

    StayWell Custom Communications print publications reach over 18 million households each quarter. Review a variety of articles written by leading healthcare journalists.

  • Health News

    View all health topics and articles currently in the news or choose to view news on a topic specifically related to your health condition.




  • HealthAtoZ Articles

    View health articles from HealthAtoZ, a leading consumer medical resource on the internet today.

  • Source Report Archives

    Newsletters from MerckSource on specific health conditions of interest to you. Read them all in the Source Report Archives.

Support Resources

  • Clinical Trials

    Access details on the clinical trials that are actively recruiting patients. Search by sponsor, medical condition, or geographic location.

  • Find Help and Support

    Learn about government and non-profit organizations, support groups, and managed care sites that may be helpful to you.