Standard medical reference resource for basic and detailed information on health concerns, a drug-interaction checker, a pill identifier, and a guide to pronunciation of medical terms.
The Merck Manual has been a standard medical reference resource for more than 100 years. This constantly updated site offers two options on its landing page: one with advanced content designed for health-care professionals, and the other a consumer site with the same subject matter translated into easy-to-understand language for patients and consumers.