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How many people will be selected for phase I trial?

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How many people will be selected for phase I trial?

(a) The whole market will be under surveillance

(b) 300-3000 people

(c) 20-300 people

(d) 20-50 people

This question was addressed to me in an online interview.

My question comes from Controlled Release Medication in portion Controlled Release Medication of Drug Biotechnology

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Right choice is (d) 20-50 people

For explanation: Phase I trials are the first stage of testing in human subjects. Normally, a small group of 20-50 healthy volunteers will be selected. This phase includes trials designed to assess the safety (pharmacovigilance), tolerability, pharmacokinetics, and pharmacodynamics of a drug. Phase 2 trial will be done on 20-300 people. Phase 3 trial will be done on 300-3000 people.

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