Phase 4 clinical trials is carried out:

A. Before the marketing approval of a drug

B. After a drug is marketed

C. For drugs used in rare disease

D. For drugs used in pediatric patients

Correct Answer: After a drug is marketed

Description: A new drug/ vaccine is launched in the market after phase III (RCT). Phase IV is 'Post marketing surveillance phase' Is the longest phase in a clinical trial. Should be carried out life long (minimum 10-25 years). Is done for finding 'long term side effects and rare side effects' of the drug.

Category: Social & Preventive Medicine

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