Which frequency abbreviation means twice daily?

Which frequency abbreviation means twice daily?

• A. QID
• B. BID
• C. QD
• D. TID

Answer: (B)

Twice-daily dosing is indicated by BID, short for bis in die. This means one dose every 12 hours, totaling two administrations in a 24-hour period. The Latin origin helps explain the frequency. In contrast, QD means once daily, TID means three times daily, and QID means four times daily. So a medication prescribed as BID should be taken, for example, every 12 hours (such as 8 am and 8 pm).

Twice-daily dosing is indicated by BID, short for bis in die. This means one dose every 12 hours, totaling two administrations in a 24-hour period. The Latin origin helps explain the frequency. In contrast, QD means once daily, TID means three times daily, and QID means four times daily. So a medication prescribed as BID should be taken, for example, every 12 hours (such as 8 am and 8 pm).