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.

Photo-onycholysis associated with drugs is an uncommon disorder.
non-adverse drug event
The text clearly states that "Photo-onycholysis associated with drugs is an uncommon disorder." So, the case report does not mention the presence of any adverse drug reaction. Therefore, the output is 'non-adverse drug event'..