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]: The patient's blurred vision gradually improved, but visual field defect remained.
[A]: non-adverse drug event


[Q]: Air conditioning and proper ventilation of the operating room, the use of coolant sprays, good suction and proper handling of amalgam waste is recommended.
[A]: non-adverse drug event


[Q]: Patients experienced a mean reduction of 92% (a mean drop in frequency of 21.7 to 1.7 episodes per week).
[A]:
non-adverse drug event