TASK DEFINITION: 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.
PROBLEM: Primary CNS lymphoma regressed on withdrawal of MM.

SOLUTION: adverse drug event

PROBLEM: PDT was performed twice, but after the second cycle, patient developed choroidal ischemia and the visual outcomes were poor.

SOLUTION: non-adverse drug event

PROBLEM: Of the four patients who responded to HU with an increase in total Hb, all reported symptomatic improvement and three have not required further transfusions.

SOLUTION:
adverse drug event