Merck Manuals
Find information on medical topics, symptoms, drugs, procedures, news and more, written in everyday language.
Merck Veterinary Manuals
Find information on animal health topics, written for the veterinary professional.
Access Merck Veterinary Manuals
MedlinePlus
MedlinePlus is a free online health information resource for patients and their families and friends. It is a service of the National Library of Medicine (NLM), the world’s largest medical library, and a part of the National Institutes of Health (NIH). It offers information on health conditions, medical tests, medications, dietary supplements, and healthy recipes.