|ERROR-PRONE DOSE DESIGNATIONS|
The dose designations found in this table have been reported to the Institute for Safe Medication Practices (ISMP) through the ISMP National Medication Errors Reporting Program (ISMP MERP) as being frequently misinterpreted and involved in harmful medication errors. They should never be used when communicating medical information. This includes internal communications, telephone/verbal prescriptions, computer-generated labels, labels for drug storage bins, medication administration records, as well as pharmacy and prescriber computer order entry screens.
and Other Information
|Trailing zero after decimal point*
|1mg||Mistaken as 10mg if the decimal point is not seen||Do not use trailing zeros for doses expressed in whole numbers|
|“Naked” decimal point*
|0.5mg||Mistaken as 5mg if the decimal point is not seen||Use zero before a decimal point when the dose is less than a whole unit|
|Abbreviations such as mg. or mL. with a period following the abbreviation||mg
|The period is unnecessary and could be mistaken as the number 1 if written poorly||Use mg, mL, etc. without a terminal period|
|Drug name and dose run together
(especially problematic for drug names that end in “I” such as Inderal40 mg; Tegretol300mg)
|Inderal 40mg||Mistaken as Inderal 140mg||Place adequate space between the drug name, dose, and unit of measure|
|Tegretol 300mg||Mistaken as Tegretol 1300mg|
|Numerical dose and unit of measure run together
(eg, 10mg, 100mL)
|The “m” is sometimes mistaken as a zero or two zeros, risking a 10- to 100-fold overdose||Place adequate space between the dose and unit of measure|
|Large doses without properly placed commas
(eg, 100000 units; 1000000 units)
|100000 has been mistaken as 10,000 or
1,000,000; 1000000 has been mistaken as 100,000
|Use commas for dosing units at or above 1,000, or use words such as 100 “thousand” or 1 “million” to improve readability|
*These abbreviations are included on The Joint Commission’s “minimum list” of dangerous abbreviations, acronyms, and symbols that must be included on an organization’s “Do Not Use” list, effective January 1, 2004. Visit www.jointcommission.org for more information about this Joint Commission requirement.
Source: Institute for Safe Medication Practices. Error-Prone Abbreviations, Symbols, and Dose Designations. 2015.
Available at: http://www.ismp.org/Tools/
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