A health or medical library is designed to assist physicians, health professionals, students, patients, consumers and medical researchers in finding health and scientific information to improve, update, assess or evaluate health care. Medical libraries are typically found in hospitals, medical schools, private industry and in medical or health associations. A typical health or medical library has access to MEDLINE, a range of electronic resources, print and digital journal collections and print reference books. The influence of open access (and free searching via Google and PubMed) is having a major impact on the way medical libraries operate.
To become accredited, every American and Canadian college of medicine, nursing, dentistry, pharmacy, veterinary medicine or public health is required to have a health or medical library appropriate to the needs of the school, as specified by an accrediting body, such as the Liaison Committee on Medical Education (LCME)'s standards. These accreditation standards include having qualified library staff on hand to answer reference questions, and provide training in using electronic resources. Some academic medical libraries are located in the same building as the general undergraduate library but most are located near or in the medical college or faculty.
The United States National Library of Medicine (NLM) is the largest biomedical library in the world, and collects and provides access to some of the best health information in the world (due to its linkage to the National Institutes of Health). The NLM maintains numerous medical and genomic databases, searchable via its Entrez search system, including MEDLINE (PubMed) and OMIM (a genetic traits database).
In support of open access (OA) to the journal literature, the U.S. NLM established an online library of digital journal articles, PubMed Central (PMC), which will soon be supplemented by a UK version. NLM works with the National Network of Libraries of Medicine (NN/LM) to provide regional medical library support in the United States, while its consumer health information service MEDLINEplus offers free access to health information, images and interactive tutorials. Many countries like Australia, Canada and the United Kingdom have well-developed medical libraries, though nothing quite as evolved as the U.S. NLM.

Associations
The Medical Library Association (MLA) is a Chicago-based advocate for library professionals and health sciences libraries - primarily in the United States. MLA maintains an online list of ALA-accredited library school programs for those who would like to pursue a master's degree in library and information studies in the US and Canada(MLIS). It furthermore administers the U.S credentialing organization for medical librarians, the Academy of Health Information Professionals(AHIP).
The Special Libraries Association has a Medical Section of the Biomedical and Life Science Division, which serves as a forum for Division members who are engaged or interested in the exchange of information in the biomedical and health sciences, and the acquisition, organization, dissemination, and use of such information in all formats.
In Canada and Australia, health librarians and libraries are represented by the Canadian Health Libraries Association and the Health Libraries Australia Group of the Australian Library and Information Association. A list of health libraries in Australia may by found on the website of the National Library of Australia.
In the United Kingdom medical (or health) librarians are represented by the Health Libraries Group of the Chartered Institute of Library and Information Professionals. CILIP. Health Libraries Group. The medical and health libraries of the German speaking countries Germany, Austria and Switzerland are represented by the Medical Libraries Association Arbeitsgemeinschaft fuer Medizinisches Bibliothekswesen (AGMB) e.V.. There are similar, if smaller, national groups in many European countries and these groups and individual health librarians and libraries are represented by the European Association for Health Information and Libraries (EAHIL).
The International Federation of Library Associations and Institutions (IFLA) has a Health and Biosciences Libraries Section. The last International Congress on Medical Librarianship (ICML) was in Brazil in 2005, in association with BIREME & PAHO, the next ICML will be in Brisbane, 2009.