prn order

prn order

Clinical pharmacology Any physician-promulgated mandate or regimen–'doctor's orders' that allows use of a therapy or modality as needed–Latin pro re nata–by the Pt; in certain situations–eg, malignancy or other terminal illnesses, PRN orders, in particular those for controlling pain–schedule II through V controlled substances, are more liberal. See Patient-controlled analgesia.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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Morehouse's order for procardia was a PRN order and the medication ordered should have been given when the patient's blood pressure was found to be 173/100.
This defeats the purpose of a PRN order, he says, and "is very poor practice."
The medication sheets revealed prn orders for only Tylenol and Milk of Magnesia.