Which statement correctly defines the medication abbreviation t.i.d.?

Which statement correctly defines the medication abbreviation t.i.d.?

• A. Twice daily
• B. Once daily
• C. Three times a day
• D. Every four hours

Answer: (C)

t.i.d. stands for ter in die, meaning three times in a 24-hour period. This is why the dosing is spaced roughly eight hours apart to keep drug levels relatively steady across the day. So the statement that three doses per day is correct. It’s different from twice daily (bid), once daily (qd), or dosing every four hours (q4h), which would indicate different schedules.

t.i.d. stands for ter in die, meaning three times in a 24-hour period. This is why the dosing is spaced roughly eight hours apart to keep drug levels relatively steady across the day. So the statement that three doses per day is correct. It’s different from twice daily (bid), once daily (qd), or dosing every four hours (q4h), which would indicate different schedules.