p.r.n.

p.r.n.

(in prescriptions) as the occasion arises; as needed.

Origin:
< Latin prō rē nāta

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Medical Dictionary

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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American Heritage
Abbreviations & Acronyms
p.r.n.
Latin pro re nata (as the situation demands)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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