The activities inherent to the medicinal practice require additional input to the medical devices and medicines, information, and the major sources of access are bibliographic data bases. 1 These should be consulted as part of the process of critical evaluation of literature, because they are resources supported by academic and scientific authorities, 2 that differentiate them from the thousands of sources of information available on the Internet, App stores and the market in general.The medical professional should consult databases when he requires bibliographic information for health care practice, teaching or research, which are the activities that generate him questions. The best route to identify and consult the relevant database is to start with the recommendations of the specialized literature, 3 the basic texts of clinical epidemiology 4 and research, manuals of elaboration of Guidelines of Clinical Practice, 5 the systematic revisions, 6 the series of publications about the use of medical literature, 7 pages, blogs, social networks and different technologies of information and communication, whose authorship be of recognized organizations.In health the first portals or websites dedicated to the collection of access to these databases emerged. 8 One of the most comprehensive Web sites is the information system set up jointly by the National Institute of Health (NIH), the DOI of original article: http://dx.