When the patient receives a drug and then presents with an adverse reaction, the best practice would be to assume that the reaction is a result of the drug.
An adverse drug reaction is described as "an interference related to the consumption of a medicinal product that results in a noticeably harmful or unpleasant reaction; adverse effects usually predict risk from prospective administration and justify preventative measures, or treatment available, or modification of the prescribed medication, or withdrawal of the product."
Since 2012, the phrase has included reactions occurring from error, misuse, or abuse along with anticipated reactions to medications that are not authorized or not being used as recommended. It also includes authorized usage of pharmaceuticals at the usual levels. The way we handle ADRs in clinical practise shouldn't be affected by this shift, despite the possibility that it will affect how medication producers and regulators track and control their products.
Therefore, in case of an allergic reaction, the best practice would be to assume that the reaction is a result of the drug.
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