The postmarketing trial comes under: (A) Phase 1 clinical trial, (B) Preclinical trial, (C) Phase 3 clinical trial, (D) Phase 4 clinical trial
Answer is D. There are 4 phases of a clinical trial. Once the drug is released into market pharmacovigilance is done - comes under phase 4 of drug trial to asses the safety, cost effectiveness of the drug once marketed Ref: K.D.Tripati.7th ed. Pg 82-83