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Common Prescription Abbreviations and Symbols

STUDY
PLAY
a (with horizontal line on top)
before; L. ante
a.c.
before meals; L. ante cibum
a.m.
before noon; L. ante meridiem
b.i.d.
twice a day; L. bis in die
d
day
h
hour; L. hora
h.s.
at the hour of sleep (bedtime); L. hora somni
noc.
night; L. noctis
p (with horizontal line on top)
after; L. post
p.c.
after meals; L. post cibum
p.m.
after noon; L. post meridiem
p.r.n.
as needed; L. pro re nata
q
every; L. quaque
q.d.
every day; L. quaque die
qh
every hour; L. quaque hora
q2h
every 2 hours
q.i.d.
four times a day; L. quarter in die
q.o.d.
every other day; L. quaque altera die
STAT
immediately; L. statium
t.i.d.
three times a day; L. ter in die
wk
week
yr
year
AD
right ear; L. auris dextra
ad lib.
as desired; L. ad libitum
amt
amount
aq
water; L. aqua
AS
left ear; L. auris sinistra
AU
both ears; L. auris unitas
c (with a horizontal line on top)
with; L. cum
NPO
nothing by mouth; L. non per os
OD
right eye; L. oculus dexter
OS
left eye; L. oculus sinister
OU
both eyes; L. oculi unita
per
by or through
Rx
recipe or prescription
s (with horizontal line on top)
without; L. sine
Sig
label or instruction to the patient; L. signa
ss (with horizontal line on top)
0.5 or use; L. semis
wa
while awake
x
times or for (x6 = times 6; x2d = for 2 days)
>
greater than
<
less than