Common medication abbreviations explained

Harold Robert Meyer / The ADD Resource Center 10/29/2024

Here are common medical abbreviations for medication timing:

1. PRN – As needed (pro re nata)
2. QD or OD – Once daily
3. BID – Twice daily (bis in die)
4. TID – Three times daily (ter in die)
5. QID – Four times daily (quater in die)
6. QHS – Every night at bedtime
7. AC – Before meals (ante cibum)
8. PC – After meals (post cibum)
9. Q4H – Every 4 hours
10. Q6H – Every 6 hours
11. Q8H – Every 8 hours
12. Q12H – Every 12 hours
13. QAM – Every morning
14. QPM – Every evening
15. STAT – Immediately/right away

For educational purposes only.

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