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.

Example Input: We studied 13 healthy volunteer subjects, performing three hepatobiliary scans in each one.
Example Output: non-adverse drug event

Example Input: The decedent was also prescribed tramadol, gabapentin, cetirizine, modafinil, carisoprodol, and Xyrem.
Example Output: non-adverse drug event

Example Input: A patient developed restless legs symptoms paralleling the course of interferon-alpha (IFN alpha) therapy for chronic hepatitis C.
Example Output:
adverse drug event

