Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of p.r.n
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
p.r.n.: Abbreviation meaning "when necessary" (from the Latin "pro re nata", for an occasion that has arisen, as circumstances require, as needed).
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