A few tools use RxNorm for drug name extraction. Levin et al. [2007] built a drug name
mapping and extraction system using RxNorm and Metaphone [Philips 1990], a phonetic
algorithm that maps an input string to a string that sounds similar to the input
string. Metaphone was used to produce a list of variants of a drug name, and these
were matched with the input string to identify the drug name. Peters et al. [2011]
employed a similar approach to identify drug names in input text, using the lexical
variant generation tool available in SPECIALIST of UMLS [McCray et al. 1994] with
additional rules to generate drug name variations.