IM
intramuscular
IV
intravenous
IV PB
intravenous piggyback
subcut
subcutaneous
SL
sublingual
ID
intradermal
GT
gastronomy tube
NG
nasogastric tube
NJ
nasojejunal tube
p.o.
by mouth
p.r.
per rectum, rectally
a.c.
before meals
p.c.
after meals
ad. lib.
as desired, freely
p.r.n.
when necessary
stat
immediately
asap
as soon as possible
b.i.d.
twice daily
t.i.d.
three times daily
q.i.d.
four times daily
min
minute
h
hour
q.h
every hour
a (with a line above)
before