Unified Medical Language System® (UMLS®)
2012AB National Drug File Source Information
The National Drug File (NDF) is produced by the U.S. Department of Veterans Affairs, Veterans Health Administration (VHA).
NDF is a centrally maintained electronic drug list used by the VHA hospitals and clinics. Facilities use the NDF to check drug interactions, to manage orders, and to send outpatient prescriptions to regional automated mail-out pharmacies.
NDF includes information on clinical drugs, drug classes, ingredients and National Drug Code (NDC) Directory codes.
The Metathesaurus representation of NDF includes only clinical drugs, ingredients, drug classes, and NDC Codes for clinical drugs.
The Metathesaurus representation of NDF has approximately 22,888 clinical drugs; 7,477 ingredients; and 579 drug classes.
NDF is updated every six weeks.
Metathesaurus Update Frequency
NDF is updated in each Metathesaurus release as part of RxNorm.
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- Nelson SJ, Brown SH, Erlbaum MS, Olson N, Powell T, Carlsen B, Carter J, Tuttle MS, Hole WT. A semantic normal form for clinical drugs in the UMLS: early experiences with the VANDF. Proc AMIA Symp. 2002:557-61. Cited in: PubMed; PMID 12463886. Available from: http://www.nlm.nih.gov/mesh/semanticnorm.html