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: Her case was complicated by social and behavioral issues.
Example Output: non-adverse drug event

Example Input: Hepatitis with bridging fibrosis and reversible hepatic insufficiency in a woman with rheumatoid arthritis taking methotrexate.
Example Output: adverse drug event

Example Input: The patient's mental status returned to baseline after treatment with intravenous phenytoin and discontinuation of ifosfamide therapy.
Example Output:
non-adverse drug event