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.

[EX Q]: Ulcer became worse after tobramycin and gentamycin treatment for 2 days.
[EX A]: adverse drug event

[EX Q]: This is not a controlled study but an anecdotal experience that resulted in improved outcomes in a patient with multiple allergies, including iron dextran.
[EX A]: non-adverse drug event

[EX Q]: In this report, a patient who had undergone a renal transplantation as a result of malignant hypertension, and who was on immunosuppressive therapy consisting of cyclosporin, prednisone and azathioprine, developed thrombosis of the central retinal vein 5 years following the transplantation.
[EX A]:
adverse drug event