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: Endometrial "sarcomas" complicating ovarian thecoma, polycystic ovarian disease and estrogen therapy.

A: non-adverse drug event
****
Q: We present a case of respiratory failure occurring in a woman at 16 weeks' gestation who was being treated with nitrofurantoin for a urinary tract infection.

A: adverse drug event
****
Q: A 71-year-old man, who had a history of a previous bullous drug reaction to a sulfonamide, began receiving an ophthalmic preparation that contained sulfacetamide sodium.

A:
adverse drug event
****