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PRN orders are typically administered based on patient symptoms, such as pain, nausea, or itching. An example of a PRN order for pain medication is “Acetaminophen 500 mg PO every 4-6 hours as needed for pain.”

Sometimes medication may be required to be given 'PRN' (Latin phrase for 'pro re nata') meaning 'when required'. This medication is usually prescribed to treat short term or intermittent medical conditions and is not to be taken regularly.

The PRN prescription stands for 'pro re nata,' which means that the administration of medication is not scheduled. Instead, the prescription is taken as needed.

Medicines with a PRN (pro re nata) or 'when required' dose can treat many different conditions. Examples include nausea and vomiting, pain, indigestion, anxiety or insomnia. People with long term conditions may also use when required medicines. For example, inhaled reliever medicines for people with asthma.

PRN orders are typically administered based on patient symptoms, such as pain, nausea, or itching. An example of a PRN order for pain medication is “Acetaminophen 500 mg PO every 4-6 hours as needed for pain.”

Pain management – PRN Medications. Naloxone() 0.4mg SC/IM/IV q2-3 min prn for narcotic induced respiratory depression. () 0.5 mg PO, one tab q6h prn for anxiety. () 0.25 mg PO, one tab q6h prn for anxiety.