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On a prescription, it means 1 by mouth (orally).
I am not sure exactly what you are asking but in medical terms "p o" means by mouth or orally.
Just to add that p.o it is the initials of the words, Per Os= By mouth
By Mouth (per Os) Or Orally
"by mouth at bedtime"
PO means is a Latin abbreviation for "by mouth" and HS is a Latin abbreviation for "at night" so that the medication by mouth at night.
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NPO is the medical abbreviation meaning nothing by mouth.
By mouth, orally, or as is known in the medical field "p.o."
I think this is a combination of P.O. plus t.i.d. plus a.c., which is: p.o. = by mouth, orally (from "per os," by mouth) t.i.d. = three times a day (from "ter in die," 3 times a day) a.c. = before meals (from "ante cibum," before meals)
Medical abbreviation is "NPO" or "npo"
The term "PO TID" on a doctor's prescription or order would mean: "by mouth, three times daily". PO means by mouth. This medical abbreviation, which is also written as: p.o. or po (lower case), comes from the Latin phrase "per os". The term TID means three times daily, or three times per daily. This medical abbreviation, which is also written as: t.i.d. or tid (lower case), comes from the later phrase "ter in die".