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.

Ex Input:
The patient completed a 10-month follow-up, maintaining a complete resolution of the treated skin lesions; however, the development of a painful hand ulcer, possibly associated with the hydroxyurea, and new skin cancers were observed at the last follow-up visit.

Ex Output:
adverse drug event


Ex Input:
He underwent uneventful cataract extraction surgery and intraocular lens implantation of the right eye.

Ex Output:
non-adverse drug event


Ex Input:
The treatment was continued for 6 months without recurrence of the symptoms.

Ex Output:

non-adverse drug event