Introduction to Drug Information: Sources, Practice, and Application

Introduction to Drug Information

Overview

Drug information (DI) refers to the provision of accurate, evidence-based information about medications to support safe and effective therapy. This practice is essential for pharmacists and other healthcare professionals, ensuring both individual patient care and broader policy decisions are informed by reliable data.

• Drug Information (DI): The process of answering medication-related questions using credible sources.

• Applications: Patient-specific cases, policy development, education, and public health.

• Channels: Face-to-face, phone/email, presentations, and digital media.

• Key Point: All pharmacists apply DI skills in practice, not just specialists.

Classification of Drug Information Sources

Tertiary, Secondary, and Primary Sources

Drug information sources are categorized based on their proximity to original research and their role in evidence synthesis.

• Tertiary Sources: Summarized and interpreted information, such as textbooks, compendia (e.g., Lexicomp, AHFS), guidelines, and FDA labeling. Fast and practical for common questions but may lag behind new evidence.

• Secondary Sources: Indexing and abstracting services (e.g., PubMed, Embase, CINAHL) that help locate primary literature.

• Primary Sources: Original research studies, including randomized controlled trials (RCTs), cohort studies, case-control studies, pharmacokinetic (PK) studies, and case reports.

Comparison Table: Drug Information Source Types

Type	Definition	Examples	Best Use
Tertiary	Summaries/interpretations built on primary evidence	Lexicomp, AHFS, textbooks, guidelines, FDA labeling	Quick reference, common questions
Secondary	Indexing/abstracting to help find primary/tertiary literature	PubMed, Embase, CINAHL	Efficient literature search
Primary	Original studies/data	RCTs, cohort/case-control studies, case reports	Detailed answers, new evidence

Evolution of Drug Information Practice

Historical Perspective

The practice of drug information has evolved significantly since the 1960s, shifting from centralized centers to embedded services across healthcare settings.

• 1960s: Establishment of Drug Information Centers (e.g., University of Kentucky), focusing on answering medication questions.

• 1980s: Growth of centers and transition to embedded services; pharmacists began leading formulary and policy decisions.

• Present: Emphasis on evidence-based practice, cost/value-based care, and informatics (EHR/EMR environments).

Pharmacist’s Drug Information Skills

Core Competencies

Pharmacists must be able to provide accurate, current answers to medication questions, identify the best resources, synthesize evidence, and communicate recommendations.

• Clinical Care: Dosing adjustments (renal/hepatic), interactions, IV compatibility, counseling.

• Policy: Formulary monographs, class reviews, policies/guidelines.

• Safety: Adverse drug event (ADE) reporting, drug shortages, investigational drug services.

• Education: Teaching peers/students, curating DI resources, informatics partnerships.

• Documentation: Succinct citation of sources, escalation/consultation when uncertainty remains.

Applying Drug Information Skills

Common Scenarios

Pharmacists encounter a variety of drug information needs, including OTC triage, product selection, patient education, compatibility, dosing adjustments, and formulary evidence.

• Process: Frame the question → Pick the right source → Verify → Document.

• Examples:

  • Can a medication be crushed for someone who can't swallow?

  • Do herbal supplements interact with birth control?

  • Can two IV drugs be run through the same line?

Drug Information Question Framing

PIO/PICO Method

Effective drug information practice begins with framing the question using the PIO (Patient/Problem, Intervention, Outcome) or PICO (Patient/Problem, Intervention, Comparison, Outcome) format.

• P: Patient or Problem (e.g., child with fever)

• I: Intervention (e.g., ibuprofen)

• C: Comparison (optional; e.g., acetaminophen)

• O: Outcome (e.g., symptom relief, safety)

Keywords are derived from the PIO/PICO to facilitate efficient literature searching.

• Example: In children with fever, does ibuprofen provide symptom relief with acceptable safety?

• Keywords: Child OR pediatric, fever, ibuprofen, adverse effects, time to relief

Evaluating and Selecting Drug Information Resources

Purpose Checklist

When selecting a resource, consider the following:

• Does it cover the specific question?

• Is it updated for safety decisions?

• Who/what stands behind it?

• Is it accessible (time, log-in, availability)?

• Are there known gaps, bias, or lag?

Common Resources

• Lexicomp: Concise layout, dosing/adjustments, interactions, clinical pearls.

• Micromedex: Detailed monographs, evidence summaries, interaction analysis.

• AHFS Drug Information: In-depth, evidence-based monographs.

• Practice Guidelines: Authoritative recommendations for therapy.

• FDA Labeling: Official safety and effectiveness information.

Quality Assessment of Consumer and Web-Based Drug Information

Quality Checklist

When using consumer-facing or web-based resources, apply a quality checklist:

• Check for conflicts of interest or sales pitches.

• Verify currency (dates, FDA/guideline consistency).

• Look for strong, non-affiliated sources and evidence trails.

• Ensure detail and references are appropriate for the audience.

• Organization should be identifiable with contact info.

Red Flags for Unreliable Information

• Absolute claims (“cures”, “zero side effects”), heavy testimonials, fear-based language.

• Excessive ads, affiliate links, cherry-picked citations, unverifiable infographics.

• Vague proprietary blends, hidden ingredients, lack of standardized dosing.

Documentation and Communication

Best Practices

Document drug information responses with source, section/heading, revision/update date, and access date. Escalate or consult when uncertainty remains, and always cite credible resources.

• Example Citation: Lexicomp. Loratadine monograph. Accessed 2024-06-01.

• Additional info: For off-label, conflicting, or special population questions, escalate to primary literature or expert consultation.

Summary Table: Drug Information Process

Step	Description
Frame the Question	Use PIO/PICO to clarify the clinical scenario
Pick the Right Source	Select the most appropriate resource (tertiary, secondary, primary)
Verify	Check for accuracy, currency, and authority
Document	Cite source, section, and date; escalate if needed

Key Takeaways

• Drug information is a core skill for pharmacists, involving the use of tertiary, secondary, and primary sources.

• Effective practice requires framing questions, selecting appropriate resources, verifying information, and documenting responses.

• Quality assessment is essential when using consumer or web-based resources.

• Always cite sources and escalate when uncertainty or special circumstances arise.