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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 |