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: Physicians using this "new" drug must be aware of the potential danger of sulfonamide-induced injury to the urinary tract.

A: adverse drug event
****
Q: Paradoxical ventricular tachycardia and fibrillation after intravenous bretylium therapy.

A: adverse drug event
****
Q: Here we present the case of a generalized lichen nitidus with involvement of the palms in a patient with hepatitis C after systemic treatment with interferon alpha and ribavirin.

A:
adverse drug event
****