The RxClass browser is a web application for exploring and navigating through the class hierarchies to find the RxNorm drug members associated with each class. RxClass links drug classes of several drug sources to their RxNorm drug members (ingredients, precise ingredients and multiple ingredients).

RxClass allows users to search by class name or identifier to find the RxNorm drug members or, conversely, search by RxNorm drug name or identifier to find the classes that the RxNorm drug is a member of.

For example, the hierarchy for Lidocaine would be (from bottom to top): Lidocaine –> Acetanilides –> Amides –> Organic Chemicals. See screenshot below.

For a list of related databases/resources suggested by the MSK Library, search for the word drug in the MSKSearch box on the Library homepage. Also, visit our Pharmacy LibGuide for a list of drug-related apps and mobile resources.