Medical abbreviations: QD, QoD, BID, TID, QID. What do they mean?

[Argirios Argiriou]

b.i.d stands for the Latin Bis in die = twice a day = twice per day. It means two times a day, usually in lower case letters.

Three times a day is t.i.d.,

four times a day is q.i.d.

For "once a day", the term is qd,

and every other day is q.o.d.


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