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 present the case of a postictal patient with lethargy, hyperammonemia, otherwise normal liver function tests, and a therapeutic valproic acid level.
Example Output: adverse drug event

Example Input: Possible relationships between the white matter lesions and extrinsic toxic agents are discussed.
Example Output: non-adverse drug event

Example Input: Sulfasalazine-induced lung disorder is an extremely rare entity which must be considered in all ulcerative colitis patients while on sulfasalazine therapy, despite the absence of pulmonary symptomatology.
Example Output:
adverse drug event

