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Drug Development Timeline: Clinical Trials

Chapter 2 Progress

Where Do New Drugs Come From?

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3. Clinical Trials

Clinical trials are conducted in three phases.

Phase I: Involves a small group of usually-healthy volunteers (though sometimes patients) who take the drug so investigators can assess safety, explore dosage ranges, and monitor for side effects.

Phase I trials last several months to a year or more. This timeline can vary depending on the complexity of the drug, the number of dose levels evaluated, and how easy it is to recruit healthy volunteers.

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