RxNorm is a standardized nomenclature for clinical drugs. The RxNorm
name
of a clinical drug combines its ingredients, strengths, and form in
which the drug is administered or is specified to be administered in a
prescription or order. RxNorm standard names for clinical drugs are
connected to the varying names of drugs present in many different
controlled vocabularies within the UMLS Metathesaurus, including
commercial drug information sources.
This filter extracts from the Metathesaurus only those concepts that
participate in the RxNorm graph of connections; that is, only concepts
that meet one of the following criteria: