prn

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prn

(in prescriptions) abbreviation for
(Pharmacology) pro re nata
[Latin: as the situation demands; whenever needed]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

p.r.n.

(in prescriptions) as the occasion arises; as needed.
[< Latin prō rē nātā]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.prn - according to need (physicians use PRN in writing prescriptions)PRN - according to need (physicians use PRN in writing prescriptions); "add water as needed"
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