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.

Peritonsillar bupivacaine infiltration, a relatively safe method of pain control, is in some centers frequently used by otolaryngologists for pain relief.
non-adverse drug event
This case report does not mention any adverse drug event. The purpose of the paper is to describe a safe method of pain control and its use by otolaryngologists for pain relief, not to report an adverse drug reaction or event. Therefore, the output is non-adverse drug event..