<prompt> Phase 4 clinical trial also called asTherapeutic confirmationPost marketing surveillanceTherapeutic exploration and dose rangingHuman pharmacology and safety  <response>: Phase IV: Postmarketing surveillance studies After the drug has been marketed for general use, practicing physicians are identified through whom data are collected on a structured proforma about the efficacy, acceptability and adverse effects of the drug. Uncommonidiosyncratic adverse effects, or those that occur only after long-term use and unsuspected drug interactions are detected at this stage. Ref:- kd tripathi; pg num:-80 