ter in die (on prescription) definition - medical term
Seen on a prescription, tid means three times a day. It is an
abbreviation for "ter in die" which in Latin means three
times a day. The
abbreviation "tid" is sometimes written without a period
either in
lower-case letters as "tid" or in capital letters as
"TID" or with periods as "t.i.d." However it is
written, it is one of a number of hallowed abbreviations of
Latin terms that
have been traditionally used in prescriptions to specify
the frequency with
which medicines should be taken.
Other examples include:
q.d. (qd or QD) is once a day; q.d. stands for "quaque
die" (which means,
in Latin, once a day).
b.i.d. (or bid or BID) is two times a day ; b.i.d.
stands for "bis in die"
(in Latin, twice a day).
q.i.d. (or qid or QID) is four times a day; q.i.d.
stands for "quater in
die" (in Latin, 4 times a day).
q_h: If a medicine is to be taken every so-many hours,
it is written "q_h"; the "q" standing for "quaque" and the
"h" indicating the number of hours. So, for example, "2
caps q4h" means "Take 2 capsules every 4 hours."
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