What abbreviation represents "two times a day"?

The abbreviation for "two times a day" is indeed represented by b.i.d., which stands for "bis in die" in Latin, directly translating to "twice a day." This notation is commonly used in medical prescriptions to indicate that a medication should be taken two times daily.

The other options represent different dosing frequencies: t.i.d. stands for "three times a day," which reflects a higher frequency of administration, while q.i.d. stands for "four times a day," indicating a dosage even more frequent. The abbreviation q.4h means "every 4 hours," which structures the dosing around a specific interval rather than a set number of times per day.

Understanding these abbreviations is essential for correctly interpreting medication instructions and ensuring proper adherence to prescribed treatments.