Pharmacovigilance (PV, or PhV), also known as drug safety, is the pharmaceutical science relating to the "collection, detection, assessment, monitoring, and prevention" of adverse effects with pharmaceutical products. The etymological roots for the word "pharmacovigilance" are: (Greek for drug) and (Latin for to keep watch). As such, pharmacovigilance heavily focuses on adverse drug reactions (ADR), which are defined as any response to a drug which is noxious and unintended, including lack of efficacy (the condition that this definition only applies with the doses normally used for the prophylaxis, diagnosis or therapy of disease, or for the modification of physiological disorder function was excluded with the latest amendment of the applicable legislation). Medication errors such as 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. Information received from patients and healthcare providers via pharmacovigilance agreements, as well as other sources such as the medical literature, plays a critical role in providing the data necessary for pharmacovigilance to take place. In order to market or to test a pharmaceutical product in most countries, adverse event data received by the license holder (usually a pharmaceutical company) must be submitted to the local drug regulatory authority. (See Adverse event reporting below.) Ultimately, pharmacovigilance is concerned with identifying the hazards associated with pharmaceutical products and with minimizing the risk of any harm that may come to patients. Companies must conduct a comprehensive drug safety and pharmacovigilance audit to assess their compliance with worldwide laws, regulations, and guidance. Terms commonly used in drug safety Pharmacovigilance has its own unique terminology that is important to understand. Most of the following terms are used within this article and are peculiar to drug safety, although some are used by other disciplines within the pharmaceutical sciences as well. The European Medicines Agency defines terms in its Guideline on good pharmacovigilance practices (GVP): Adverse drug reaction is effects arising when drug given even in therapeutic dose either immunologically mediated reaction or pharmacologically mediated adverse response or idiosyncratic reaction due to the peculiarities of individual. Adverse event (AE) is a side effect occurring with a drug. By definition, the causal relationship between the AE and the drug is unknown. Benefits are commonly expressed as the proven therapeutic good of a product but should also include the