Final answer:
The abbreviation 'PO/PR' in '30 mg PO/PR Morphine' indicates both oral and rectal administration routes for morphine, meaning it can be either taken by mouth or given rectally. The correct interpretations are 30 milligrams per os (oral) and 30 milligrams per rectum.
Step-by-step explanation:
The abbreviation 'PO/PR' in the medical prescription '30 mg PO/PR Morphine' relates to the routes of administration for morphine. PO stands for 'per os', which is Latin for 'by mouth', and PR stands for 'per rectum', which is a method of delivering a medication rectally.
The correct answer in this case is:
b) 30 milligrams per rectum - This indicates that the intended route is rectal administration.
It is important to note that although 'PO' also appears in the prescription, indicating oral administration, the presence of 'PR' specifies that rectal administration is an available option too. Hence, both c) 30 milligrams per os (oral) and b) 30 milligrams per rectum are technically correct, depending on the context provided by the prescriber.