In what phase of clinical trials is the new drug give to a small number of people who are extensively test to measure, absorption, distribution, metabolism, and excretion, and to look for side effects and toxicities?

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Phase I trials are the first stage of testing in human subjects. They are designed to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of a drug. This phase involves a small number of healthy volunteers or patients and focuses on how the drug is absorbed, distributed, metabolized, and excreted, as well as identifying any potential side effects.

In What Phase of Clinical Trials Is the New Drug