•  U, or u,
•  IU
•  QD
•  QOD
•  trailing zero after decimal point (e.g. 2.0)
•  lack of leading zero
•  MS, MSO4, MgSO4
•  AU or AS or AD
•  X3d
•  Apothecary System
•  D/C
•  TIW or tiw
•  ug
•  drug combination nicknames (e.g. Banana Bag)

•  write "units"
•  write "International Units"
•  write daily
•  write every other day
•  do not use
•  always use a zero before a decimal point
•  write out "morphine sulfate" or "magnesium sulfate"
•  spell out: "both ears", "left ear" or "right ear"
•  spell out number of days to be given (e.g. times 3  days)
•  use Metric System
•  spell out intended meaning: "discharge" or "stop"
•  spell out days the drug is to be administered
•  spell out microgram or use mcg
•  list all drugs separately