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p.r.n.

1.
(in prescriptions) as the occasion arises; as needed.
Origin of p.r.n.
From the Latin word prō rē nāta
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for prn

prn

abbreviation (in prescriptions)
1.
pro re nata
Word Origin
Latin: as the situation demands; whenever needed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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prn in Medicine

p.r.n. or PRN
abbr.
Latin pro re nata (as the situation demands)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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