Pharmacovigilance is the pharmacological science relating to the collection, detection, assessment, monitoring and prevention of adverse effects with pharmaceutical products. The etymological roots for the word pharmacovigilance are: pharmakon and vigilare. As like pharmacovigilance heavily focuses on adverse drug reactions which are defined as any response to a drug which is noxious and unintended including lack of efficacy Medication errors like overdose and misuse and abuse of a drug as well as drug exposure during pregnancy and breastfeeding are also of interest even without an adverse event, because they may result in an adverse drug reaction.