A nurse is reinforcing teaching with a newly licensed nurse about transcribing medication prescriptions. Which of the following prescriptions should the newly licensed nurse identify is an accurate transcription?

A. Lorazepam 0.5 mg PO PRN at bedtime: This transcription clearly specifies the drug name, exact dose with a leading zero before the decimal, route (PO), frequency (at bedtime), and PRN indication. It follows safe medication transcription guidelines, minimizing the risk of dosing errors. B. Doxazosin .5 mg PO at bedtime: Omitting the leading zero before the decimal (0.5 mg) is unsafe, as the decimal point could be misread as 5 mg, resulting in a tenfold dosing error. Proper transcription requires a leading zero for doses less than 1 mg. C. Heparin 5000 U subcutaneous every 8 hr: The abbreviation “U” for units can be misread as “0” or “4,” leading to potential overdose. Safe practice recommends spelling out “units” to prevent misinterpretation. D. MgSO4 10 g PO daily: Magnesium sulfate is rarely administered orally in gram quantities without clear indication, and transcription should specify the salt form, dose, and route carefully. The prescription may be ambiguous and requires clarification before transcription.