The postmarketing trial comes under
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
Phase 1 clinical trial
Preclinical trial
Phase 3 clinical trial
Phase 4 clinical trial
General pharmacology