What does the medical abbreviation 1 po tid mean?
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".