In pharmacology, any unexpected or dangerous reaction to a drug or vaccine.

An unexpected medical problem that happens during treatment with a drug or other therapy. Adverse events do not have to be caused by the drug or therapy, and they may be mild, moderate, or severe. Als [..]

Occurrence which causes an adverse effect. Note: An adverse event in clinical studies is any untoward reaction in a human subject participating in a research project; such an adverse event, which may [..]

An untoward medical occurrence in a patient taking part in a clinical trial.

Healthcare term for any event that is not consistent with the desired, normal or usual operation of the organization; also known as a sentinel event.

Term used when a volunteer in a clinical trial has a negative or unfavourable reaction to a drug, etc.

An unfavorable change in the health of a participant, including abnormal laboratory findings, that happens during a clinical study or within a certain time period after the study has ended. This chang [..]

Any undesirable event experienced by a person while they are having a drug or any other treatment or intervention, regardless of whether or not the event is suspected to be related to or caused by the [..]

A negative experience encountered by an individual during the course of a clinical trial, that is associated with the drug. An AE can include previously undetected symptoms, or the exacerbation of a pre-existing condition. When an AE has been determined to be related to the investigational product, it is considered an Adverse Drug Reaction.

An incident involving harm to a person receiving health care. It includes infections, falls and other injuries, and reactions or complications due to surgery and other procedures, medical devices or medication, some of which may be preventable. Adverse events in health care can occur inside or outside hospitals and can be the cause of hospitalisati [..]

An incident in which harm resulted to a person receiving health care

1. with regard to medical care, an impairment or dangerous impact arising from healthcare interference or analysis. 2. with regard to pharmacological medicine, reference adverse drug reaction.

An unfavorable change in the health of a participant, including abnormal laboratory findings, that happens during a clinical study or within a certain time period after the study is over. This may or [..]

Any undesirable experience associated with the use of a drug or other medical product. See Related Term(s): Adverse Drug Reaction

An adverse outcome that occurs during or after the use of a drug or other intervention but is not necessarily caused by it. (Source: Cochrane; accessed 20 Nov 09)

Any untoward medical occurrence that may appear during treatment with a pharmaceutical product but which does not necessarily have a causal relationship with the treatment. Adverse event following imm [..]

An unexpected medical problem that happens during treatment with a drug or other therapy. Adverse events do not have to be caused by the drug or therapy, and they may be mild, moderate, or severe. Also called adverse effect.

A possible side effect resulting from a vaccination.

Any undesirable side effect that may result from a vaccination.

See Guidelines on the reporting of adverse drug reactions by drug sponsors: Definitions

A toxic reaction to a medical therapy. (09 Oct 1997)

Adverse event (AE) is defined as "any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product and which does not necessarily have to have a causal relationship with this treatment." Techniques to evaluate AEs can include case control studies, post-marketing surveillance programs, pr [..]

An adverse outcome that occurs during or after the use of a drug or other intervention but is not necessarily caused by it.See also: Adverse effect

Any untoward medical occurrence that may present during treatment with a pharmaceutical product but which does not necessarily have a causal relationship with this treatment. Synonym: adverse experien [..]

An unexpected medical problem that happens during treatment with a drug or other therapy. Adverse events do not have to be caused by the drug or therapy, and they may be mild, moderate, or severe.

Any untoward medical occurrence in a patient or clinical trial subject administered a medicinal product and which does not necessarily have a causal relationship with this treatment.

Any untoward occurrence associated with the collection, testing, processing, storage and distribution of blood and blood components that might lead to death or life threatening, disabling or incapacit [..]

Any unintended and unfavorable sign, symptom, abnormality, or condition temporally associated with an intervention that may or may not have a causal relationship with the intervention, medical treatment, or procedure. Adverse reaction is a type of adverse event.

Any undesirable experience associated with the use of a medical product in a patient. Serious adverse events include: death, disability or permanent damage, congenital anomaly/birth defect and require [..]