Medical Definition of p.r.n.
p.r.n.: Abbreviation meaning "when necessary" (from the Latin "pro re nata", for an occasion that has arisen, as circumstances require, as needed).Source: MedTerms™ Medical Dictionary
Last Editorial Review: 5/13/2016
Medical Dictionary Definitions A - Z
Search Medical Dictionary
- Personalized Tips for Managing Migraine
- Do You Take Good Care of Your Eyes?
- Tips for a Clean Home & Healthy Cat