1
D
day
H
Hour
NKDA
no known drug allergies
QD
Every day
BID
Two times a day
W
week
B
Bi or two
NKA
No known allergies
TID
Three times a day
TIW
Three times a week
T
Tri or three
Q
every
Q4H
every 4 hours
Q2H
every two hours
QHS
every "hour of sleep" or every night at bedtime
QID
four times a day
ER/XR/XL
Extended Release -- medication should not be crushed or chewed
CR
Controlled release -- medication should not be crushed or chewed
DR
Delayed release -- medication should not be crushed or chewed
LA
Long Acting -- medication should not be crushed or chewed
CD
Controlled delivery -- medication should not be crushed or chewed
SR
Sustained release
TR
Time release -- medication should not be crushed or chewed