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definitions
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p.r.n.

  1. (in prescriptions) as the occasion arises; as needed.
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Origin of p.r.n.

From the Latin word prō rē nāta
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

p.r.n. in Medicine

p.r.n.

abbr.
  1. pro re nata (as the situation demands)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.