When used on a prescription, "PR" indicates a particular:

Comprehensive and Detailed Step-by-Step Explanation:

The abbreviation "PR" stands for "per rectum", which is a route of administration where the medication is inserted into the rectum for absorption.

????Explanation of Answer Choices:

✅A. Route of administration → Correct. "PR" means rectal administration (e.g., suppositories).

❌B. Frequency of dosing → Incorrect. Frequency abbreviations include BID (twice daily), QD (once daily), etc.

❌C. Medication strength → Incorrect. Strength is indicated by mg, mcg, etc.

❌D. Dosage form → Incorrect. Dosage forms include tablets, capsules, solutions, etc.

????Reference:

ISMP List of Common Prescription Abbreviations

PTCB Exam: Medication Order Interpretation