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Which one of the following will be checked under phase IV surveillance?

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Which one of the following will be checked under phase IV surveillance?

(a) The whole market will be under surveillance

(b) 300-3000 people

(c) 20-300 people

(d) 20-50 people

I have been asked this question in a national level competition.

I'm obligated to ask this question of Controlled Release Medication topic in section Controlled Release Medication of Drug Biotechnology

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Correct option is (a) The whole market will be under surveillance

To explain: Phase IV trial is also known as Post Marketing Surveillance Trial. Phase IV trials involve safety surveillance (pharmacovigilance) and ongoing technical support of a drug after it receives permission to be sold. Phase 1 trial will be done on 20-50 people. Phase 2 trial will be done on 20-300 people. Phase 3 trial will be done on 300-3000 people.

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