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Rx Abbreviations
Term | Meaning | Caution |
---|---|---|
ac & hs | before meals and at bedtime | no warning |
ad | right ear | "a" can be mistaken as an "o" which could read "o.d.", meaning right eye |
am | morning, before noon | no warning |
amp | ampule (ampul, ampoule) | no warning |
amt | amount | no warning |
as | left ear | "a" can be mistaken as an "o" which could read "o.s." or "o.l", meaning left eye |
au | both ears | "a" can be mistaken as an "o" which could read "o.u.", meaning both eyes |
bid | twice daily | AMA style avoids use of this abbreviation (spell out "twice a day") |
BM | bowel movement | no warning |
BS | blood sugar | no warning |
BSA | body surface area | no warning |
bucc | buccal (inside cheek) | no warning |
cap | capsule | no warning |
c | with (usually written with a bar on top of the "c") | no warning |
cc | cubic centimeter | use mL instead-less confusing |
d | days [or] doses | ambiguous meaning, write out "days" or "doses" |
D5LR | dextrose 5% in lactated Ringer's solution (intravenous sugar solution) | no warning |
D5NS | dextrose 5% in normal saline (0.9%) (intravenous sugar solution) | no warning |
D5W | dextrose 5% in water (intravenous sugar solution) | no warning |
D10W | dextrose 10% in water (intravenous sugar solution) | no warning |
DAW | dispense as written (i.e., no generic substitution) | no warning |
DC | discontinue [or] discharge | ambiguous meaning |
disp | dispense | no warning |
g | gram (modern SI symbol is g, not gm) | no warning |
garg | gargle | no warning |
gr | grain | no warning |
gtt(s) | drop(s) | no warning |
h | hour | no warning |
hs | at bedtime [or] half-strength | ambiguous (2 meanings, easily conflated); spell out |
IBW | ideal body weight (for dosing based on clearance estimation) | no warning |
inj | injection | mistaken for "IV", meaning intravenously |
IM | intramuscular | no warning |
IN | intranasal | mistaken for "IM", meaning intramuscular, or "IV", meaning intravenously |
i | Roman Numeral for 1 | no warning |
ii | Roman Numeral for 2 | no warning |
iii | Roman Numeral for 3 | no warning |
IT | intrathecal | mistaken for other abbreviations; spell out |
IU | international unit | RED ALERT: mistaken for "IV" or "10", spell out "international unit" |
IV | intravenous | no warning |
IVP | intravenous push | no warning |
IVPB | intravenous piggyback | no warning |
kg | kilogram | no warning |
lb | pound | no warning |
max | maximum | no warning |
mcg | microgram | Recommended replacement for "µg" which may be confused with "mg" |
mEq | milliequivalent | no warning |
mg | milligram | no warning |
MgSO4 | magnesium sulfate | RED ALERT: may be confused with "MSO4", spell out "magnesium sulfate" |
mL | milliliter | no warning |
MS | morphine sulfate or magnesium sulfate | RED ALERT: can mean either morphine sulfate or magnesium sulfate, spell out either |
MSO4 | morphine sulfate | RED ALERT: may be confused with "MgSO4", spell out "morphine sulfate" |
nebul | a spray (such as for insufflation) | no warning |
NMT | not more than | no warning |
noct | at night | no warning |
non rep or NR | no repeats (no refills) | no warning |
NPO | nothing by mouth | AMA style avoids use of this abbreviation (spell out "nothing by mouth") |
NS | normal saline (0.9%) | no warning |
1/2NS | half-normal saline (0.45%) | no warning |
NTE | not to exceed | no warning |
od | right eye | "o" can be mistaken as an "a" which could read "a.d.", meaning right ear, confusion with "omni die" |
os | left eye | "o" can be mistaken as an "a" which could read "a.s.", meaning left ear |
ou | both eyes | "o" can be mistaken as an "a" which could read "a.u.", meaning both ears |
oz | ounce | no warning |
pm | evening or afternoon | no warning |
po | by mouth or orally | AMA style avoids use of this abbreviation (spell out "orally") |
pr | rectally | no warning |
prn | as needed | no warning |
pv | vaginally | no warning |
q | every, per | no warning |
q 1 h | every 1 hour (can replace "1" with other numbers) | no warning |
q4PM | at 4 pm (can replace "4" with other numbers) | mistaken to mean every 4 hours |
q am | every morning (every day before noon) | no warning |
q d | every day | mistaken for "QOD" or "qds," spell out "every day" or "daily". AMA style avoids use of this abbreviation (spell out "every day") |
q hs | every night at bedtime | can be mistaken as "q.h.r." (every hour) |
qid | 4 times a day | can be mistaken for "qd" or "qod," write out "4 times a day". AMA style avoids use of this abbreviation (spell out "4 times a day") |
qod | every other day | RED ALERT: mistaken for "QD," spell out "every other day". AMA style avoids use of this abbreviation (spell out "every other day") |
qs | a sufficient quantity | no warning |
QWK | every week | no warning |
rep | repeats | no warning |
RL | Ringer's lactate | no warning |
℞ | take (often effectively a noun meaning "prescription"—medical prescription or prescription drug) | no warning |
rep | let it be repeated | no warning |
SC | subcutaneous | "SC" can be mistaken for "SL," meaning sublingual. See also SQ |
sig | write (write on the label) | no warning |
s | without (usually written with a bar on top of the "s") | no warning |
sl | sublingually, under the tongue | no warning |
SOB | shortness of breath | no warning |
sol | solution | no warning |
ss | one-half [or] sliding scale | mistaken for "55" or "1/2" |
SSI | sliding scale insulin or sliding scale regular insulin | mistaken to mean "strong solution of iodine" or "selective serotonin reuptake inhibitor". See also SSRI |
SQ | subcutaneously | "SQ" can be mistaken for "5Q" meaning "5 every dose". See also SC |
SSRI | selective serotonin reuptake inhibitor [or] sliding scale regular insulin | ambiguous. Do not abbreviate |
stat | immediately | no warning |
SubQ | subcutaneously | no warning |
supp | suppository | no warning |
susp | suspension | no warning |
syr | syrup | no warning |
tab | tablet | no warning |
tbsp | tablespoon | no warning |
tid | 3 times a day | AMA style avoids use of this abbreviation (spell out "3 times a day") |
tinct | tincture | no warning |
tiw | 3 times a week | mistaken for "twice a week" |
TPN | total parenteral nutrition | no warning |
tinc | tincture | no warning |
trit | grind to a powder | no warning |
troch | lozenge | no warning |
tsp | teaspoon | no warning |
U | unit | RED ALERT: mistaken for a "4", "0" or "cc", spell out "unit" |
ud or ut dict | as directed | no warning |
ung | ointment | no warning |
USP | United States Pharmacopeia | no warning |
vag | vaginally | no warning |
w | with | no warning |
w/a | while awake | no warning |
wf | with food (with meals) | no warning |
w/o | without | no warning |
x | times | no warning |
yo | years old | no warning |
μg | microgram | mistaken for "mg", meaning milligram |
> | greater than | mistaken for a "7" |
< | less than | mistaken for an "L" |
℔ | pound | no warning |
℥ | ounce | RED ALERT: apothecary symbol confusing |
ʒ | dram (drachm) | RED ALERT: apothecary symbol confusing |
℈ | scruple | RED ALERT: apothecary symbol confusing |
ug | until gone | no warning |