Which statement describes retrospective DUR?

• A. At dispensing time
• B. Weeks or months after dispensing
• C. Before prescribing
• D. At the point of sale

Answer: (B)

Retrospective DUR analyzes drug-use data after the dispensing event, looking back over past prescriptions and patient records to spot safety signals, adherence issues, or pattern problems. Because it uses historical data, the review happens weeks or months after the medication has been dispensed. This contrast with prospective DUR, which screen before or during dispensing to prevent problems in real time. The point-of-sale timing isn’t typically how DUR is described, since DUR focuses on clinical data and dispensing history rather than the sale transaction itself.