Some resources Doctors use: Medscape [1] which is owned by WebMD; Sources like MPR [2] for handy drug information and The Medical Letter [3] for in-depth medication reviews; UpToDate [4]; various journals depending on specialty, The New England Journal of Medicine being one of the most prestigious [5]; the Sanford Guide for infectious diseases [6].

[1] https://www.medscape.com/

[2] https://www.empr.com/

[3] https://secure.medicalletter.org/

[4] https://www.uptodate.com/home

[5] https://www.nejm.org/

[6] https://www.sanfordguide.com/