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.
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Question: Nail staining from hydroquinone cream.

Answer: adverse drug event


Question: In summary, we report herein the first case of SIADH believed to be an adverse effect of mizoribin, which may therefore needed to be added to the list of drugs which can induce SIADH.

Answer: adverse drug event


Question: A case of successful treatment of antibiotic-associated pseudomembranous colitis with oral metronidazole is reported.

Answer:
non-adverse drug event