BMJ Best Practice This link opens in a new windowBMJ Best Practice is a easy-to-use decision-support tool that provides authoritative answers to clinical questions. It contains information relating to over 10,000 diagnoses, more than 3,000 diagnostic tests and over 4,000 diagnostic and treatment guidelines. At its core, Best Practice contains the internationally renowned Clinical Evidence. Drug information is provided by Martindale: the Complete Drug Reference. Martindale can be accessed via the Drugs menu or by selecting a drug when viewing a condition or symptom.