Using a drug manual to answer a Medical Information question represents which level of evidence?

Using a drug manual to answer a Medical Information question represents which level of evidence?

• A. Primary
• B. Tertiary
• C. Secondary
• D. Quaternary

Answer: (B)

The main idea here is how sources sit in the evidence hierarchy. A drug manual is a tertiary source. It provides concise, practical information about a drug—indications, dosing, interactions, contraindications, and safety notes—compiled from primary studies and regulatory labeling, but it does not present new research or perform a fresh synthesis of multiple studies. That’s the role of primary sources (the original research) or secondary sources (systematic reviews, meta-analyses). So, while a drug manual is excellent for quick reference, it’s not the place to look for new evidence or comprehensive synthesis of efficacy data.

The main idea here is how sources sit in the evidence hierarchy. A drug manual is a tertiary source. It provides concise, practical information about a drug—indications, dosing, interactions, contraindications, and safety notes—compiled from primary studies and regulatory labeling, but it does not present new research or perform a fresh synthesis of multiple studies. That’s the role of primary sources (the original research) or secondary sources (systematic reviews, meta-analyses). So, while a drug manual is excellent for quick reference, it’s not the place to look for new evidence or comprehensive synthesis of efficacy data.