A nurse is assisting in preparing an in-service program about preventing medication errors when transcribing a prescription. The nurse is using a dosage example of two tenths of a milligram. Which of the following transcription examples should the nurse use?

A. 0.20 mg: Writing the dose as 0.20 mg includes a trailing zero after the decimal point, which is considered unsafe because if the decimal point is accidentally omitted, the dose could be misread as 20 mg instead of 0.2 mg—a 100-fold overdose. This is why the Joint Commission and ISMP recommend never using trailing zeros for doses less than 1 mg. B. 0.2 mg: This is the safe and accurate transcription of two-tenths of a milligram. The leading zero before the decimal point (0.2) clearly indicates that the dose is less than 1 mg, and the absence of a trailing zero prevents misreading or miscalculation. This format follows accepted medication safety standards. C. 2 mg: Writing 2 mg changes the intended dose from 0.2 mg to 2 mg, which is 10 times higher than prescribed. Administering this amount could cause severe toxicity or adverse effects, making it an unsafe transcription. D. 2.0 mg: Similar to option C, 2.0 mg represents two milligrams, not two-tenths of a milligram. Additionally, the trailing zero poses a risk of tenfold error if the decimal point is misread or omitted, further emphasizing the danger.