PubMed
PubMed is a service of the U.S. National Library of Medicine that includes over 17 million citations from MEDLINE and other life science journals for biomedical articles back to the 1950s. PubMed includes links to full text articles and other related resources.

Medscape
A website for physicians and medical students with comprehensive information about diseases, drugs, and clinical procedures. Registration is required (you will need to register as a medical student). Note: the Medscape app for the iPad provides a very helpful interface for the same content.

Guyton-Hall Textbook Site
Website associated with the Guyton-Hall textbook.

American Physiological Society
The American Physiological Society is the major North American Society that promotes research and teaching in the discipline of physiology. The website provides links for educational resources, as well as research awards (including those for undergraduate students).

Physiology Information Page
Physiology is generally divided into ten major organ systems. This website looks at each one in a bit more detail.

WebMD
WebMD is a site with considerable medically-related information presented in lay terms.

Drugs.com
Drugs.com is the most popular, comprehensive and up-to-date source of drug information online. Providing free, accurate and independent advice on more than 24,000 prescription drugs, over-the-counter medicines and natural products.

NIH Health Information
Medical-related information from the National Institutes of Health.

Medline-Plus
Drug and health information from the National Library of Medicine.