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 as an accurate transcription?

A. Doxazosin .5 mg PO at bedtime is incorrect. The dose should be written as "0.5 mg" to include the leading zero, following proper medication administration guidelines. B. Lorazepam 0.5 mg PO PRN at bedtime is incorrect. "PRN" should include a specific indication (e.g., anxiety, insomnia. for when it is to be administered. C. Heparin 5000 U subcutaneous every 8 hr is correct. The prescription is clear and includes the correct dose, route, and frequency of administration. D. MgSO4 10 g PO daily is incorrect. Magnesium sulfate is typically administered intravenously, not orally, unless specified otherwise for specific conditions, and the dosage is quite high for oral administration.