Understanding the Phases of Clinical Trials: A Step-by-Step Overview
Clinical trials are conducted in a series of steps or phases, each designed to answer specific questions about a new medical treatment or intervention. Here's an overview of the phases of clinical trials : 1. **Phase 0**: This phase involves very limited human exposure to the drug, often with just a few doses given to a small number of subjects. The primary goal is to gather initial data on how the drug behaves in the body and its potential effects. 2. **Phase I**: In this phase, the drug is tested in a small group of healthy volunteers (20-100) to determine its safety, dosage range, and side effects. The focus is on understanding how the drug is metabolized and excreted, and identifying any early signs of potential efficacy. 3. **Phase II**: If the drug passes Phase I, it moves to Phase II, where it is tested in a larger group of patients (100-500) who have the condition the drug is intended to treat. This phase aims to gather more information about the drug's safety and effec...