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.

Example Input: We report the first case of polymorphic ventricular tachycardia with normal QT interval associated with the oral use of levofloxacin in the absence of other etiologies known to cause these arrhythmias.
Example Output: adverse drug event

Example Input: In December 1998, he applied to our clinic for a follow-up examination.
Example Output: non-adverse drug event

Example Input: It is the first case of ciprofloxacin-induced VBDS successfully treated with tacrolimus.
Example Output:
adverse drug event