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PRN is latin for pro re nata and can be used as part of a prescription.
The format of a prescription usually is the (drug trade name), generic name, dosage, frequency and route of adminstration.
Commonly used PRN drugs include paracetamol/acetaminophen, salbutamol, laxatives etc in inpatient settings.
Two examples could be:
Rx paracetamol 1g PRN (qds max) PO - Give 1g of paracetamol as required (maximum four times a day) by mouth.
Rx salbutamol 5mg PRN nebulised. - Give 5mg of salbutamol through a nebuliser as required.
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