What is the primary purpose of the Investigator's Brochure?

• A. To train site staff in general clinical trial procedures
• B. To record all adverse events during the trial for regulatory submission
• C. To market the investigational product to potential investigators
• D. To provide investigators with information to understand the rationale for the protocol and ensure compliance with dose, dose frequency/interval, methods of administration, and safety monitoring

Answer: (D)

The Investigator's Brochure is a reference document that gives investigators the information they need to conduct the study safely and in compliance. Its primary purpose is to present the rationale for the protocol and to ensure the conduct aligns with the trial design by detailing the dosing regimen, routes and methods of administration, and the safety monitoring plan. It compiles all relevant data on the investigational product—pharmacology, toxicology, pharmacokinetics, and prior clinical experience—and explains known risks and how to manage them. Updates are issued when new information could affect participant safety or trial conduct.

Other options describe activities outside this main purpose: training staff in general procedures is handled through protocol training and SOPs; recording all adverse events is part of safety reporting and data collection during the trial; marketing the product to investigators is not a function of the Investigator's Brochure.