Drug Information Resources and Databases

Drug information resources and databases are the tools through which medication questions are answered, ranging from textbook compendia to bibliographic indexes and original studies. They are conventionally tiered into tertiary, secondary, and primary sources, and choosing the right tier for a given question is the first practical skill of drug information practice.

Definition

Drug information resources and databases are the organised collections of medicines knowledge — reference compendia, indexing and abstracting databases, and original research reports — used to retrieve and answer questions about drugs.

Scope

This topic covers the classification of drug information resources into tertiary, secondary, and primary literature, the role of bibliographic and pharmaceutical databases in retrieval, and the criteria used to judge the currency and reliability of a source. It is a reference and methodological topic and does not provide product-specific dosing or treatment instructions.

Core questions

• What distinguishes tertiary, secondary, and primary drug information sources?
• When is each tier the appropriate starting point for a question?
• How are bibliographic databases searched systematically and reproducibly?
• How is the currency, scope, and reliability of a resource judged?

Key concepts

• Tertiary literature (compendia, textbooks)
• Secondary literature (bibliographic databases, indexes)
• Primary literature (original studies)
• Systematic search strategy
• Controlled vocabulary and indexing terms
• Currency and authority of a source

Mechanisms

Resources are tiered by how processed the information is. Tertiary sources summarise established knowledge and are efficient for background questions but can lag behind recent evidence. Secondary databases index and abstract the primary literature, allowing structured searches by indexing terms and keywords to locate relevant studies. Primary sources are the original reports that secondary databases point to and that critical appraisal then evaluates. A well-built search moves deliberately across these tiers, and reproducible retrieval — the kind PRISMA expects to be documented for an evidence synthesis — depends on transparent search strategies in secondary databases.

Clinical relevance

Selecting an appropriate resource tier and searching it competently determine whether a medication question is answered accurately and efficiently. This topic describes how drug evidence is located and weighed and supports literature retrieval; it is not a substitute for product labelling or individualised clinical judgement.

Evidence & guidelines

Reproducible literature retrieval is a documented expectation of evidence-synthesis reporting: the PRISMA 2020 statement asks authors to report full search strategies for every database queried, which has reinforced standards for how secondary databases are searched and recorded.

History

Hospital drug information centres of the 1960s relied chiefly on print compendia and indexes. The computerisation of bibliographic indexing and the later growth of online pharmaceutical and clinical databases transformed retrieval, while the evidence-based medicine movement emphasised moving beyond tertiary summaries to the appraised primary literature.

Key figures

• David Sackett
• Patrick Malone

Seminal works

• sackett-1996
• malone-2018

Frequently asked questions

Which type of source should I consult first?

It depends on the question: a tertiary compendium is efficient for established background, while a recent or controversial clinical question usually requires moving to secondary databases and the primary literature.

Why document a search strategy?

A recorded, reproducible search strategy lets others verify what was looked for and found, which is why evidence-synthesis reporting standards require full search strategies for each database.