An<unk>  <unk>  is a harmful, unintended result caused by taking medication.<unk> s may occur following a single dose or prolonged administration of a drug or result from the combination of two or more drugs. The meaning of this term differs from the term "side effect" because side effects can be beneficial as well as detrimental. The study of<unk> s is the concern of the field known as pharmacovigilance. An<unk>  drug event (ADE) refers to any unexpected and inappropriate occurrence at the time a drug is used, whether or not associated with the administration of the drug. An<unk>  is a special type of ADE in which a causative relationship can be shown.<unk> s are only one type of medication-related harm, as harm can also be caused by omitting to take indicated medications.
Adverse drug reaction
Bullous drug reaction
Anticonvulsant hypersensitivity syndrome
Idiosyncratic drug reaction
Drug interaction
Foreign body reaction
Drug intolerance
Paraneoplastic syndrome