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

Words nearby p.r.n.

Origin of p.r.n.

From the Latin word prō rē nāta
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Medicine definitions for p.r.n.



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.