Definition of DNS
DNS: On a prescription, Do Not Substitute. If a physician orders a particular drug and writes DNS on the prescription, that tells the pharmacist not to substitute a generic version or any other drug for the prescribed drug.
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=25257
Last Editorial Review: 6/14/2012
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