Prospective vs Retrospective DUR: PTCB Guide

Comparing DUR Types for the PTCB Exam

Understanding the differences between prospective and retrospective drug utilization review (DUR) is a commonly tested concept on the PTCB certification exam. This guide breaks down each type, explains when it occurs, and clarifies how pharmacy technicians are involved in each process.

Prospective DUR: Before Dispensing

Prospective DUR is the real-time evaluation of a prescription before it reaches the patient. It is the frontline defense against medication errors in community pharmacy.

How It Works

When a pharmacy technician enters a new prescription into the pharmacy system, the software automatically runs the prescription against the patient's medication profile, allergy list, and clinical parameters. If a potential problem is detected, the system generates an alert.

What Prospective DUR Checks

• Drug-drug interactions: Checking the new prescription against all other active medications
• Drug-allergy alerts: Comparing the new drug against documented allergies
• Therapeutic duplication: Flagging when two drugs from the same class are prescribed simultaneously
• Dose range checking: Verifying the prescribed dose falls within accepted parameters
• Early refill detection: Identifying prescriptions refilled sooner than expected

Technician Role in Prospective DUR

Pharmacy technicians are responsible for maintaining accurate patient profiles that make prospective DUR effective. When an alert fires, the technician must bring it to the pharmacist's attention. Never bypass or ignore a DUR alert without pharmacist review.

Retrospective DUR: After Dispensing

Retrospective DUR analyzes prescribing and dispensing data after medications have already been provided to patients. It uses historical claims data to identify patterns and trends.

How It Works

Insurance companies, pharmacy benefit managers (PBMs), and healthcare organizations analyze claims databases to identify patients who may have medication-related problems. These reviews may trigger outreach to prescribers or patients.

What Retrospective DUR Identifies

• Overutilization: Patients using more medication than expected, which may indicate misuse or diversion
• Underutilization: Patients not refilling chronic medications regularly, indicating poor adherence
• High-risk prescribing patterns: Use of medications on the Beers Criteria list in elderly patients
• Polypharmacy: Patients receiving medications from multiple prescribers without coordination
• Controlled substance patterns: Doctor shopping or other concerning controlled substance utilization

Technician Role in Retrospective DUR

Pharmacy technicians may assist with retrospective DUR by pulling reports, contacting patients for follow-up, and scheduling appointments for medication reviews triggered by retrospective analysis.

Key Differences for the PTCB Exam

Feature	Prospective DUR	Retrospective DUR
Timing	Before dispensing	After dispensing
Setting	Pharmacy point of sale	Administrative/claims level
Data source	Real-time patient profile	Historical claims data
Action	Immediate (prevent/intervene)	Delayed (identify/correct)
Primary user	Pharmacist at the counter	PBMs, insurance, QA teams

Practice Questions

The PTCB exam may present scenarios asking you to identify which type of DUR is being described. Focus on the timing of the review relative to dispensing. Test your knowledge with PTCB practice exams at PTCBprep.