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.

[Q]: TEN is a disease of both children and adults, but TEN in early infancy is a rare event; only two well-documented cases in infants less than 6 months of age have been reported.
[A]: non-adverse drug event


[Q]: Two patients who developed decreased visual acuity after several months of ethambutol treatment for Mycobacterium avium-intracellulare infection had bitemporal visual field defects that suggested optic chiasm damage.
[A]: adverse drug event


[Q]: A week prior, the patient was started on folic acid 1 mg orally daily and given an injection of vitamin B12 1000 microg intramuscularly that was continued every 3 cycles thereafter.
[A]:
non-adverse drug event


