Three times daily is abbreviated as which?

• A. q.d.
• B. bid
• C. q.i.d.
• D. t.i.d.

Answer: (D)

Dosing frequency abbreviations come from Latin terms that describe how often a medication is taken in a day. Three times daily is ter in die, abbreviated t.i.d. This means taking a dose three times per day, roughly every 8 hours. The other common frequencies correspond to different schedules: q.d. means once daily, bid means twice daily, and q.i.d. means four times daily. Therefore, t.i.d. is the correct shorthand for three doses in a day.