PRN Dosing
PRNDefinition
From the Latin 'pro re nata' meaning 'as the situation demands' — medications taken only when needed rather than on a fixed schedule. PRN dosing is common for pain relievers, anti-anxiety medications, and rescue inhalers.
Example
Albuterol inhalers are prescribed PRN for asthma — used only when the patient experiences breathing difficulty, not on a scheduled basis.