Definition of adverse reaction in English English dictionary
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
an unintended and unwanted side effect of some sort of treatment, usually drug therapy (Source : AMA)
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)
An undesirable or unwanted consequence of a preventive, diagnostic or therapeutic procedure, e g , adverse reaction to smallpox vaccination See also side effect
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
Reaction of an organism to a drug that is different from the desired reaction and is determined to be detrimental to the organism
An unexpected effect of drug treatment that may be serious or life threatening, such as an allergic reaction
WHO Technical Report No 498 (1972); 'A response to a drug which is noxious and unintended, and which occurs at doses normally used in man for the prophylaxis, diagnosis, or therapy of disease, or for the modification of physiological function
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 adverse drug reaction (abbreviated ADR) is an expression that describes harm associated with the use of given medications at a normal dose. The meaning of this expression differs from the meaning of "side effect", as this last expression might also imply that the effects can be beneficial. The study of ADRs is the concern of the field known as pharmacovigilance