||Mistaken as a zero or a four (4) resulting in overdose. Also mistaken for "cc" (cubic centimeters) when poorly written.
||Mistaken for "mg" (milligrams) resulting in an overdose.
||Latin abbreviation for every day
||The period after the "Q" has sometimes been mistaken for an " I, " and the drug has been given "QID" (four times daily) rather than daily.
||Latin abbreviation for every other day
||Misinterpreted as "QD" (daily) or "QID" (four times daily). If the "O" is poorly written, it looks like a period or "I."
|SC or SQ
||Mistaken as "SL" (sublingual) when poorly written.
|T I W
||Three times a week
||Misinterpreted as "three times a day" or "twice a week."
||Discharge; also discontinue
||Patient's medications have been prematurely discontinued when D/C, (intended to mean "discharge") was misinterpreted as "discontinue," because it was followed by a list of drugs.
||Misinterpreted as the Latin abbreviation "HS" (hour of sleep).
||Mistaken as "U" (units) when poorly written.
|AU, AS, AD
||Latin abbreviation for both ears; left ear; right ear
||Misinterpreted as the Latin abbreviation "OU" (both eyes); "OS" (left eye); "OD" (right eye)
||Mistaken as IV (intravenous) or 10(ten)
|MS, MSO4, MgSO4
||Confused for one another
||Can mean morphine sulfate or magnesium sulfate