Commonly Used Abbreviations

Before Meals
Twice a day
At bedtime
Whenever this is needed
Every two hours
Every six hours
Four times daily
Give immediately
As desired
Hour
After meals
Every morning
Every hour
Every four hours
Every eight hours
Three times a day

AC
BID
HS
PRN
Q2h
Q6h
QID
STAT
Ad lib
H
PC
QAM
Qh
Q4h
Q8h
TID

References
Potter, P. & Perry, A. (2005). Fundamental of Nursing (6th edition). St. Louis, Missouri: Mosby.