Certified Clinical Research Associate (CCRA) Practice Exam 2025 – Complete Preparation Guide

The primary purpose of Phase I clinical trials is to determine safety and dosage in humans. Phase I trials are the first step in testing a new drug or treatment in human subjects, typically involving a small group of healthy volunteers or patients. The main objectives during this phase include assessing how the drug is metabolized and excreted in the body, evaluating its safety profile, and identifying any side effects. Additionally, researchers aim to establish the optimal dosing regimen for further studies.

In the context of clinical research, establishing safety is crucial before proceeding to later phases, where larger groups of subjects are involved to evaluate efficacy and gather more comprehensive data on the drug’s effects. Although the other options pertain to different aspects of clinical trials, such as long-term effectiveness, interactions with other medications, and patient quality of life, these are more relevant to later phases (like II and III) rather than the primary focus of Phase I.