Ter in die (on prescription)

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.</P> 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.' </LI></UL>