Definition of Adverse reaction

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Adverse reaction Definition from Science & Technology Dictionaries & Glossaries
BioProcess International™ Glossary
undesirable effect of a drug, vaccine, or medical device; it can be as mild as a short-term injection-site irritation or as serious as a life-threatening acute onset of anaphylaxis; also referred to as adverse event.
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Adverse reaction Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In medicine, an adverse effect is a harmful and undesired effect resulting from a medication or other intervention such as surgery.

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Adverse reaction Definition from Medicine Dictionaries & Glossaries
Hepatitis Central (TM) Liver Disease Medical Glossary
Unintended and unwanted side effect of some sort of treatment, usually drug therapy
Aids Glossary
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.
Aegis
Glossary of HIV/AIDS-Related Terms
(Adverse Event.) An unwanted effect detected in clinical trial in participants. The term is used whether or not the effect can be attributed to the intervention under study. See Side Effects.
ATIS
HIV Vaccine Glossary
in a clinical trial, an unwanted effect detected in participants and attributed to the study vaccine.