Aptitude Test for Health Professionals

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What does it mean if a medication for a patient is designated "PRN"?

Take twice per day
Take once per day
Take whenever
Only if needed

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Interesting fact:

Nurses have to be pretty fit to keep up with the physical demands of their job. Along with lifting heavy items (and people!), nurses walk around 4-5 miles a day on average. And many nurses are on their feet for 12 hours in a row!