What are different phases in clinical evaluation of a drug in human beings?

Clinical evaluation of a drug in human beings is a critical part of the drug development process that assesses its safety, efficacy, and tolerability before the drug can be marketed for general use. This evaluation is typically conducted in multiple phases, each designed to answer specific questions about the drug. The clinical evaluation process involves several stages, ranging from initial testing in small groups of healthy volunteers to large-scale trials in diverse patient populations. These phases are outlined below:

Phase 0: Preclinical Phase

Before clinical trials in humans can begin, drugs undergo preclinical testing. This phase primarily involves laboratory research and animal studies to assess the drug's safety profile and its pharmacokinetics (absorption, distribution, metabolism, and excretion). This phase helps researchers understand the potential for the drug to interact with biological systems and its toxicological effects. Although it is not technically a part of clinical trials, it sets the foundation for the next phases of human testing.

Phase I: First-in-Human Trials

Phase I is the first phase of clinical trials in humans, and it ____ _____ _________ ________ _________ __________ ____ ___ _________ _______ ________.
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