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I always just thought it was Per RN, but the latin makes more sense, as usual. You will sometimes see drug orders like "3mg ambien PRN for insomnia, up to 5mg/24 period"
PRN = "As needed" / pro re nata
Since this is kinda of being buried here, this is the real meaning of PRN.
The technical Latin definition of this is really: "for the thing born". Its amazing how things develop into other definitions.
PO=Per Os
NPO=Nil per os