OD
Once a day
BID
twice a day
TID
thrice a day
QID
four times a day
prn
if/when necessary
stat
now, immediately, at once
ODBB
once a day before breakfast
q
every
h/H
hours/hourly
h.s.
hours of sleep/ at bedtime
od
occulus dexter/ right eye
os
occulus sinister/ left eye
ou
occulus uterque/ both eyes
ac
ante cebum/ before meals
pc
post cebum/ after meals
ad.lib
as desired
NPO
nothing per orem/nothing by mouth
P
prescribed
NA
not available/not applicable
OOP
out on pass
R
refused
AMA
against medical advice
HAMA
home against medical advice
H
hold