What is the issue with using a trailing zero in prescriptions?

• A. It has no impact on dosing accuracy.
• B. It can lead to a 10-fold dose error if the decimal point is overlooked.
• C. It ensures a more precise dose.
• D. It is required for all high-dose prescriptions.

Answer: (B)

Trailing zeros after a decimal can be dangerous because the decimal point may be missed during handwriting or transcription, turning a dose into ten times (or more) the intended amount. For example, 1.0 mg could be read as 10 mg, and 0.50 mg could be read as 50 mg if the decimal point is overlooked. This is why trailing zeros are avoided on prescriptions—they don’t improve precision and instead create a real risk of a tenfold dosing error. The safer practice is to write doses without unnecessary trailing zeros (e.g., 1 mg or 0.5 mg) and use clear formatting to minimize misreading.