It is the study of the utilization and effects of drugs in large numbers of people; it provides an estimate of the probability of beneficial effects of a drug in a population and the probability of adverse effects. It concentrates on clinical patient outcomes from therapeutics by using methods of clinical epidemiology. Pharmacovigilance is a part of this which involves continual monitoring in population for unwanted effects and safety concerns.
List of Related Journals
Advances in Pharmacoepidemiology and Drug Safety,  Journal of Pharmacoepidemiology, Journal of Clinical Pharmacology and Pharmacoepidemiology.