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.

INTRODUCTION: Despite high success rates with free-tissue transfer, flap loss continues to be a devastating event.
non-adverse drug event

The immune tolerance in a 12-year-old haemophilia A patient was carried out at the Faculty of Medicine, Ramathibodi Hospital, Bangkok in 1998.
non-adverse drug event

We postulate that gastritis caused by dexamethasone, mucositis caused by doxorubicin, and the unique anatomic nature of a Meckel diverticulum may have contributed to this extremely unlikely and previously unreported event.

adverse drug event