PRN medication
Also written as: PRN — pro re nata
Medication prescribed to be given 'as needed' rather than on a fixed schedule, based on patient symptoms or circumstances.
Full Definition
PRN medication refers to drugs prescribed with instructions for administration 'as needed' (from the Latin 'pro re nata') rather than at scheduled intervals. In psychiatric settings, PRN medications are commonly used for managing acute symptoms like anxiety, agitation, insomnia, or breakthrough psychotic symptoms. Orders must specify the indication, maximum dose, frequency limits, and monitoring requirements. Proper documentation of PRN administration includes the reason given, time administered, patient response, and any adverse effects. This approach allows for flexible symptom management while maintaining safety protocols.
Usage
Usage note: Write as 'PRN' in all caps, never 'prn' or 'p.r.n.'
In Context
- "The psychiatrist ordered lorazepam 1mg PRN for severe anxiety, not to exceed three doses per day." — Medication order
- "Nursing staff administered the PRN antipsychotic after the patient became increasingly agitated during group therapy." — Nursing note