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.

There had been one episode of chest discomfort in her past history.
non-adverse drug event

This was initially diagnosed as a spreading dental infection.
non-adverse drug event

A 51-year-old man developed type 1 diabetes mellitus following 24 weeks of treatment with recombinant alpha-2b peginterferon plus ribavirin for chronic hepatitis C.

adverse drug event