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What does 'prn' mean in medical jargon?

  1. prior notice

  2. when necessary

  3. prepare nightly

  4. patient not ready

The correct answer is: when necessary

In medical jargon, 'prn' stands for "when necessary" and is often used as an abbreviation for "as needed". Option A, prior notice, may seem similar due to the 'pr' at the beginning, but it does not accurately match the meaning of 'prn'. Options C and D are unrelated and do not match the context of the question. 'Prn' is commonly used in situations where a medication or treatment is not needed on a regular schedule, but only as needed for a specific symptom or condition. This term allows for flexibility in treatment and medication administration.