aa
of each
ac
before meals
Aq
water
ATC/ ARC
around the clock
BID
twice a day
BM
bowel movement
BP
blood pressure
c
with
Caps
capsule
gr
grain
gtt
a drop
HS
at bedtime
IV
intravenous injection
IM
intramuscular injection
ID
intradermal injection, infectious disease
noct
at night
po
by mouth
prn
when necessary
q
every
qd
every day
qid
four times daily
qod
every other day
qs
as much as is sufficient
qh
every hour