An adverse event reported in the approved product information of a drug; or an adverse event for which some assessment has been made of whether it was caused by a given therapy (eg involving the proposed drug).

An unintended effect from a drug.

a harmful or unexpected effect of a medication or treatment

An unwanted toxic reaction to or side effect of drug treatment (e.g., rash, nausea, peripheral neuropathy, bone marrow suppression, liver, or kidney failure).

In a CTIMP, any untoward and unintended response in a subject to an IMP which is related to any dose administered to that subject. See also SSAR and SUSAR.

a harmful, unexpected and unintended response to a drug

an opposing or contrary reaction

a noxious and unintended response to a natural health product that occurs at any dose used or tested for the diagnosis, treatment or prevention of a disease or for modifying an organic function

a noxious and unintended response to any dose of a drug product for which there is a reasonable possibility that the product caused the response

an undesirable effect, reasonably associated with the use of the device, that may occur as part of the effect of the device or may be unpredictable in its occurrence

an undesirable effect, reasonably associated with the use of the drug, that may occur as part of the pharmacological action of the drug or may be unpredictable in its occurrence

an unexpected and unwanted response to a drug that results in illness, organ failure, or death

an unpredictable reaction to a drug (many side effects are known to be associated with a drug and are listed on label)

an untoward effect that occurs after a vaccination and is extraneous to the vaccine's primary purpose of producing immunity

a reaction which is noxious and unintended and which

An unwanted side effect that may be caused by a medication. This may or may not need medical attention.

An unwanted or negative effect occurring in response to an intervention being used in a research study.

An unfavourable, or even harmful effect or event resulting from a health care treatment or procedure.

An unintended side effect of a vaccine. (The intended effect of a vaccine is to produce immunity.) Adverse reactions may be local, systemic, or allergic.

(Adverse Event.) An unwanted effect caused by the administration of drugs. Onset may be sudden or develop over time.

side-effect; an undesirable or allergic response to a drug. Many of the drugs used to fight HIV Disease cause adverse reactions in a small number of people. Some side effects are minor, and others go away after a few days. A few are truly nasty and require quick medical attention. If you think you are having an adverse reaction to a drug, contact your doctor immediately.

a toxic reaction or side effect, e.g., due to treatment with a drug. Adverse reactions may range from mild effects such as rash, headache, nausea or drowsiness, to more severe effects such as peripheral neuropathy, bone marrow suppression, seizures and liver or kidney failure.

In pharmacology, any unexpected or dangerous reaction to a drug. An unwanted effect caused by the administration of a drug. The onset of the adverse reaction may be sudden or develop over time. See the entire definition of Adverse reaction

An untoward medical occurrence caused by and arising after the administration of a medicine under normal conditions of use.

an unwanted effect detected in clinical trial in participants.

See adverse drug reaction.

(Also called side effect) In a clinical trial, an unwanted effect detected in participants and attributed to the study vaccine.

negative side effect resulting from the use of a drug (for example, hepatitis, nausea, headache). Also called a side effect.

An unexpected effect of drug treatment that may range from trivial to serious or life-threatening, such as an allergic reaction.

Unintended or harmful effect to the body caused by the administration of drugs; also known as an adverse event.

an unintended and unwanted side effect of some sort of treatment, usually drug therapy