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Home / Glossary / PRN Medication (Pro Re Nata)

PRN Medication (Pro Re Nata)

Definition: "Pro re nata" — Latin for "as the circumstance arises." Medication taken only when needed, not on a fixed schedule, usually with a minimum interval between doses.

Examples

  • Pain reliever for occasional headache — max every 4 hours, no more than 6 doses per day.
  • Anti-anxiety medication for panic attacks — as needed, cooldown 8 hours.

Why It Matters

PRN medications are inherently harder to track than scheduled ones. Without a cooldown timer, patients risk taking doses too close together. Without a daily maximum, overuse is invisible. A good PRN reminder system tracks: last dose timestamp, minimum cooldown, daily limit, and pattern detection (increasing frequency may indicate worsening condition).

Related Topics

  • Medication Schedule — PRN is a schedule type.
  • Chronic Medication — opposite: fixed schedule.

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Complex Schedules

PRN as a schedule type.

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