What does PRN stand for?

MLA style: "PRN." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 <a href="http://www.acronymfinder.com/Patient-Reader-Necessary-(medication-advice)-(PRN).html">http://www.acronymfinder.com/Patient-Reader-Necessary-(medication-advice)-(PRN).html
Chicago style: Acronym Finder . S.v. "PRN." Retrieved June 2 2012 from <a href="http://www.acronymfinder.com/Patient-Reader-Necessary-(medication-advice)-(PRN).html">http://www.acronymfinder.com/Patient-Reader-Necessary-(medication-advice)-(PRN).html
APA style: PRN. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from <a href="http://www.acronymfinder.com/Patient-Reader-Necessary-(medication-advice)-(PRN).html">http://www.acronymfinder.com/Patient-Reader-Necessary-(medication-advice)-(PRN).html

Patient Reader Necessary (medication advice)

This definition appears very rarely and is found in the following Acronym Finder categories:

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