IM
intramuscular
IV
intravenous
IVPB
intravenous piggyback
IVP
intravenous push
Subq, sub-q, sq
subcutaneous
PO
by mouth (oral/swallowed)
SL
sublingual (held under tongue)
ac
before meals
pc
after meals
ad lib
as desired/ freely
prn
as needed
stat
immediately
bid
twice a day
tid
three times a day
qid
four times a day
qh
every hour
q2h
every 2 hours
a
before
p
after
c
with
s
without
ss
one half
NPO
nothing by mouth
q3h
every 3 hours
q6h
every 6 hours