TheInvestigator’s Brochure (IB)is a critical regulatory document designed to provide investigators with comprehensive knowledge about an investigational product.

ICH E6(R2) 7.1:Defines the IB as “a compilation of the clinical and nonclinical data on the investigational product(s) that are relevant to the study of the product(s) in human subjects.”

ICH E6(R2) 7.2.2:Specifies the IB should contain asummary of pharmacological, toxicological, pharmacokinetic, and metabolic studies in animals, as well as results from previous human experience.

The purpose is to allow investigators to makerisk-benefit assessments, support protocol design, and ensure subject safety.

Incorrect options:

A (instructions to conduct study) describes theprotocol, not the IB.

C (financial disclosures) are required under21 CFR 54, not part of the IB.

D refers totrial master file/essential documents, not the IB.

Therefore, the IB’s defining function is to provide ascientific summary of preclinical and clinical datasupporting safe human use.