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: On discontinuation of the drug, serum CK concentrations returned to normal within eight days.
Example Output: non-adverse drug event

Example Input: Pravastatin is associated with myotonia in animals.
Example Output: adverse drug event

Example Input: To the authors' knowledge, this is the first report in the English-language literature of spontaneous neonatal intracerebral hemorrhage, due to thrombosis of the superior or inferior vena cava.
Example Output:
non-adverse drug event