Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

Q: A case of priapism associated with trazodone is described.

A: adverse drug event
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Q: PURPOSE: To describe bilateral optic neuritis that occurred as an adverse effect of recombinant and natural interferon alpha administration.

A: adverse drug event
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Q: Therefore, although garenoxacin reportedly causes fewer adverse reactions for cardiac rhythms than third-generation quinolone antibiotics, one must be cautious of the interference of other drugs during hypokalemia in order to prevent TdP.

A:
adverse drug event
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